1265656670 has 32 divisors (see below), whose sum is σ = 2319226560. Its totient is φ = 497168640.

The previous prime is 1265656603. The next prime is 1265656697. The reversal of 1265656670 is 766565621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 510554 + ... + 513026.

It is an arithmetic number, because the mean of its divisors is an integer number (72475830).

Almost surely, 2^1265656670 is an apocalyptic number.

1265656670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1265656670 is a deficient number, since it is larger than the sum of its proper divisors (1053569890).

1265656670 is a wasteful number, since it uses less digits than its factorization.

1265656670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3380.

The product of its (nonzero) digits is 453600, while the sum is 44.

The square root of 1265656670 is about 35576.0687822587. The cubic root of 1265656670 is about 1081.6962000837.

The spelling of 1265656670 in words is "one billion, two hundred sixty-five million, six hundred fifty-six thousand, six hundred seventy".