12661651370 has 16 divisors (see below), whose sum is σ = 22793947560. Its totient is φ = 5063999424.

The previous prime is 12661651369. The next prime is 12661651393. The reversal of 12661651370 is 7315616621.

It can be written as a sum of positive squares in 4 ways, for example, as 9261945121 + 3399706249 = 96239^2 + 58307^2 .

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, 1916 + ... + 159144.

Almost surely, 2^12661651370 is an apocalyptic number.

12661651370 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12661651370 is a deficient number, since it is larger than the sum of its proper divisors (10132296190).

12661651370 is a wasteful number, since it uses less digits than its factorization.

12661651370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165289.

The product of its (nonzero) digits is 45360, while the sum is 38.

The spelling of 12661651370 in words is "twelve billion, six hundred sixty-one million, six hundred fifty-one thousand, three hundred seventy".