1256264664 has 32 divisors (see below), whose sum is σ = 3171763440. Its totient is φ = 414608000.

The previous prime is 1256264627. The next prime is 1256264687. The reversal of 1256264664 is 4664626521.

It is a congruent 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, 256707 + ... + 261554.

Almost surely, 2^1256264664 is an apocalyptic number.

It is an amenable number.

1256264664 is an abundant number, since it is smaller than the sum of its proper divisors (1915498776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1256264664 is a wasteful number, since it uses less digits than its factorization.

1256264664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518371 (or 518367 counting only the distinct ones).

The product of its digits is 414720, while the sum is 42.

The square root of 1256264664 is about 35443.8240600531. The cubic root of 1256264664 is about 1079.0139216229.

The spelling of 1256264664 in words is "one billion, two hundred fifty-six million, two hundred sixty-four thousand, six hundred sixty-four".