12640166265 has 32 divisors (see below), whose sum is σ = 20888119296. Its totient is φ = 6523070400.

The previous prime is 12640166251. The next prime is 12640166291. The reversal of 12640166265 is 56266104621.

It is not a de Polignac number, because 12640166265 - 2⁴ = 12640166249 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22561 + ... + 160590.

It is an arithmetic number, because the mean of its divisors is an integer number (652753728).

Almost surely, 2^12640166265 is an apocalyptic number.

12640166265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12640166265 is a deficient number, since it is larger than the sum of its proper divisors (8247953031).

12640166265 is a wasteful number, since it uses less digits than its factorization.

12640166265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183309.

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 12640166265 in words is "twelve billion, six hundred forty million, one hundred sixty-six thousand, two hundred sixty-five".