256511032465 has 8 divisors (see below), whose sum is σ = 307816041960. Its totient is φ = 205206957312.

The previous prime is 256511032457. The next prime is 256511032513. The reversal of 256511032465 is 564230115652.

It can be written as a sum of positive squares in 4 ways, for example, as 134983494801 + 121527537664 = 367401^2 + 348608^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256511032465 - 2³ = 256511032457 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 737151 + ... + 1027819.

It is an arithmetic number, because the mean of its divisors is an integer number (38477005245).

Almost surely, 2^256511032465 is an apocalyptic number.

It is an amenable number.

256511032465 is a deficient number, since it is larger than the sum of its proper divisors (51305009495).

256511032465 is a wasteful number, since it uses less digits than its factorization.

256511032465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467171.

The product of its (nonzero) digits is 216000, while the sum is 40.

The spelling of 256511032465 in words is "two hundred fifty-six billion, five hundred eleven million, thirty-two thousand, four hundred sixty-five".