1256172564 has 12 divisors (see below), whose sum is σ = 2931069344. Its totient is φ = 418724184.

The previous prime is 1256172527. The next prime is 1256172569. The reversal of 1256172564 is 4652716521.

1256172564 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256172569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52340512 + ... + 52340535.

Almost surely, 2^1256172564 is an apocalyptic number.

It is an amenable number.

1256172564 is an abundant number, since it is smaller than the sum of its proper divisors (1674896780).

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

1256172564 is a wasteful number, since it uses less digits than its factorization.

1256172564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104681054 (or 104681052 counting only the distinct ones).

The product of its digits is 100800, while the sum is 39.

The square root of 1256172564 is about 35442.5247971981. The cubic root of 1256172564 is about 1078.9875525481.

The spelling of 1256172564 in words is "one billion, two hundred fifty-six million, one hundred seventy-two thousand, five hundred sixty-four".