1258536645 has 12 divisors (see below), whose sum is σ = 2181463596. Its totient is φ = 671219520.

The previous prime is 1258536641. The next prime is 1258536647. The reversal of 1258536645 is 5466358521.

1258536645 is a `hidden beast` number, since 1 + 2 + 58 + 536 + 64 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 735819876 + 522716769 = 27126^2 + 22863^2 .

It is not a de Polignac number, because 1258536645 - 2² = 1258536641 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 27967481 = 1258536645 / (1 + 2 + 5 + 8 + 5 + 3 + 6 + 6 + 4 + 5).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1258536645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1258536641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13983696 + ... + 13983785.

It is an arithmetic number, because the mean of its divisors is an integer number (181788633).

Almost surely, 2^1258536645 is an apocalyptic number.

1258536645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1258536645 is a deficient number, since it is larger than the sum of its proper divisors (922926951).

1258536645 is a wasteful number, since it uses less digits than its factorization.

1258536645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27967492 (or 27967489 counting only the distinct ones).

The product of its digits is 864000, while the sum is 45.

The square root of 1258536645 is about 35475.8600318583. The cubic root of 1258536645 is about 1079.6640029897.

The spelling of 1258536645 in words is "one billion, two hundred fifty-eight million, five hundred thirty-six thousand, six hundred forty-five".