1264637345 has 4 divisors (see below), whose sum is σ = 1517564820. Its totient is φ = 1011709872.

The previous prime is 1264637317. The next prime is 1264637357. The reversal of 1264637345 is 5437364621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 214358881 + 1050278464 = 14641^2 + 32408^2 .

It is a cyclic number.

It is not a de Polignac number, because 1264637345 - 2¹⁸ = 1264375201 is a prime.

It is a super-2 number, since 2×1264637345² = 3198615228737298050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126463730 + ... + 126463739.

It is an arithmetic number, because the mean of its divisors is an integer number (379391205).

Almost surely, 2^1264637345 is an apocalyptic number.

It is an amenable number.

1264637345 is a deficient number, since it is larger than the sum of its proper divisors (252927475).

1264637345 is an equidigital number, since it uses as much as digits as its factorization.

1264637345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252927474.

The product of its digits is 362880, while the sum is 41.

The square root of 1264637345 is about 35561.7399040036. The cubic root of 1264637345 is about 1081.4057326558.

The spelling of 1264637345 in words is "one billion, two hundred sixty-four million, six hundred thirty-seven thousand, three hundred forty-five".