256603400612 has 24 divisors (see below), whose sum is σ = 499198678272. Its totient is φ = 114611940000.

The previous prime is 256603400609. The next prime is 256603400687. The reversal of 256603400612 is 216004306652.

It is a happy number.

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, 79590014 + ... + 79593237.

It is an arithmetic number, because the mean of its divisors is an integer number (20799944928).

Almost surely, 2^256603400612 is an apocalyptic number.

It is an amenable number.

256603400612 is a deficient number, since it is larger than the sum of its proper divisors (242595277660).

256603400612 is a wasteful number, since it uses less digits than its factorization.

256603400612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159183299 (or 159183297 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The spelling of 256603400612 in words is "two hundred fifty-six billion, six hundred three million, four hundred thousand, six hundred twelve".