1257568245 has 12 divisors (see below), whose sum is σ = 2179785036. Its totient is φ = 670703040.

The previous prime is 1257568243. The next prime is 1257568261. The reversal of 1257568245 is 5428657521.

1257568245 is a `hidden beast` number, since 12 + 57 + 568 + 24 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 631717956 + 625850289 = 25134^2 + 25017^2 .

It is not a de Polignac number, because 1257568245 - 2¹ = 1257568243 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: 27945961 = 1257568245 / (1 + 2 + 5 + 7 + 5 + 6 + 8 + 2 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 1257568245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257568241) 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, 13972936 + ... + 13973025.

It is an arithmetic number, because the mean of its divisors is an integer number (181648753).

Almost surely, 2^1257568245 is an apocalyptic number.

1257568245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1257568245 is a deficient number, since it is larger than the sum of its proper divisors (922216791).

1257568245 is a wasteful number, since it uses less digits than its factorization.

1257568245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27945972 (or 27945969 counting only the distinct ones).

The product of its digits is 672000, while the sum is 45.

The square root of 1257568245 is about 35462.2086875592. The cubic root of 1257568245 is about 1079.3870106828.

The spelling of 1257568245 in words is "one billion, two hundred fifty-seven million, five hundred sixty-eight thousand, two hundred forty-five".