1256161804 has 6 divisors (see below), whose sum is σ = 2198283164. Its totient is φ = 628080900.

The previous prime is 1256161799. The next prime is 1256161811. The reversal of 1256161804 is 4081616521.

It is a self number, because there is not a number n which added to its sum of digits gives 1256161804.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157020222 + ... + 157020229.

Almost surely, 2^1256161804 is an apocalyptic number.

It is an amenable number.

1256161804 is a deficient number, since it is larger than the sum of its proper divisors (942121360).

1256161804 is a wasteful number, since it uses less digits than its factorization.

1256161804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314040455 (or 314040453 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 1256161804 is about 35442.3730018180. The cubic root of 1256161804 is about 1078.9844717773.

The spelling of 1256161804 in words is "one billion, two hundred fifty-six million, one hundred sixty-one thousand, eight hundred four".