1256536325 has 24 divisors (see below), whose sum is σ = 1739296416. Its totient is φ = 892584000.

The previous prime is 1256536321. The next prime is 1256536397. The reversal of 1256536325 is 5236356521.

It is not a de Polignac number, because 1256536325 - 2² = 1256536321 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256536321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41306 + ... + 64955.

It is an arithmetic number, because the mean of its divisors is an integer number (72470684).

Almost surely, 2^1256536325 is an apocalyptic number.

It is an amenable number.

1256536325 is a deficient number, since it is larger than the sum of its proper divisors (482760091).

1256536325 is a wasteful number, since it uses less digits than its factorization.

1256536325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106325 (or 106320 counting only the distinct ones).

The product of its digits is 162000, while the sum is 38.

The square root of 1256536325 is about 35447.6561284382. The cubic root of 1256536325 is about 1079.0916931528.

The spelling of 1256536325 in words is "one billion, two hundred fifty-six million, five hundred thirty-six thousand, three hundred twenty-five".