12565640610 has 48 divisors (see below), whose sum is σ = 34592473656. Its totient is φ = 3153729024.

The previous prime is 12565640609. The next prime is 12565640629. The reversal of 12565640610 is 1604656521.

12565640610 is a `hidden beast` number, since 1 + 2 + 5 + 6 + 5 + 640 + 6 + 1 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 12333657249 + 231983361 = 111057^2 + 15231^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4104889 + ... + 4107948.

Almost surely, 2^12565640610 is an apocalyptic number.

12565640610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12565640610 is an abundant number, since it is smaller than the sum of its proper divisors (22026833046).

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

12565640610 is a wasteful number, since it uses less digits than its factorization.

12565640610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8212867 (or 8212864 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 12565640610 in words is "twelve billion, five hundred sixty-five million, six hundred forty thousand, six hundred ten".