256400653364 has 6 divisors (see below), whose sum is σ = 448701143394. Its totient is φ = 128200326680.

The previous prime is 256400653357. The next prime is 256400653387. The reversal of 256400653364 is 463356004652.

It can be written as a sum of positive squares in only one way, i.e., 174341321764 + 82059331600 = 417542^2 + 286460^2 .

It is a super-3 number, since 3×256400653364³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32050081667 + ... + 32050081674.

It is an arithmetic number, because the mean of its divisors is an integer number (74783523899).

Almost surely, 2^256400653364 is an apocalyptic number.

It is an amenable number.

256400653364 is a deficient number, since it is larger than the sum of its proper divisors (192300490030).

256400653364 is a wasteful number, since it uses less digits than its factorization.

256400653364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64100163345 (or 64100163343 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 44.

The spelling of 256400653364 in words is "two hundred fifty-six billion, four hundred million, six hundred fifty-three thousand, three hundred sixty-four".