1256550564 has 24 divisors (see below), whose sum is σ = 2942319520. Its totient is φ = 417369024.

The previous prime is 1256550551. The next prime is 1256550569. The reversal of 1256550564 is 4650556521.

It is a happy number.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1256550569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181609 + ... + 188400.

Almost surely, 2^1256550564 is an apocalyptic number.

It is an amenable number.

1256550564 is an abundant number, since it is smaller than the sum of its proper divisors (1685768956).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1256550564 is a wasteful number, since it uses less digits than its factorization.

1256550564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370299 (or 370297 counting only the distinct ones).

The product of its (nonzero) digits is 180000, while the sum is 39.

The square root of 1256550564 is about 35447.8569733066. The cubic root of 1256550564 is about 1079.0957692065.

The spelling of 1256550564 in words is "one billion, two hundred fifty-six million, five hundred fifty thousand, five hundred sixty-four".