1256265630 has 24 divisors (see below), whose sum is σ = 3266290872. Its totient is φ = 335004144.

The previous prime is 1256265599. The next prime is 1256265641. The reversal of 1256265630 is 365626521.

It is a happy number.

1256265630 is a `hidden beast` number, since 1 + 2 + 562 + 65 + 6 + 30 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6979164 + ... + 6979343.

It is an arithmetic number, because the mean of its divisors is an integer number (136095453).

Almost surely, 2^1256265630 is an apocalyptic number.

1256265630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1256265630 is an abundant number, since it is smaller than the sum of its proper divisors (2010025242).

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

1256265630 is a wasteful number, since it uses less digits than its factorization.

1256265630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13958520 (or 13958517 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 1256265630 is about 35443.8376872483. The cubic root of 1256265630 is about 1079.0141981908.

The spelling of 1256265630 in words is "one billion, two hundred fifty-six million, two hundred sixty-five thousand, six hundred thirty".