256402412465 has 8 divisors (see below), whose sum is σ = 307685639040. Its totient is φ = 205120100592.

The previous prime is 256402412449. The next prime is 256402412489. The reversal of 256402412465 is 564214204652.

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 256402412465 - 2⁴ = 256402412449 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, 854162 + ... + 1114628.

It is an arithmetic number, because the mean of its divisors is an integer number (38460704880).

Almost surely, 2^256402412465 is an apocalyptic number.

It is an amenable number.

256402412465 is a deficient number, since it is larger than the sum of its proper divisors (51283226575).

256402412465 is a wasteful number, since it uses less digits than its factorization.

256402412465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457351.

The product of its (nonzero) digits is 460800, while the sum is 41.

The spelling of 256402412465 in words is "two hundred fifty-six billion, four hundred two million, four hundred twelve thousand, four hundred sixty-five".