12561091570 has 16 divisors (see below), whose sum is σ = 22612524480. Its totient is φ = 5023867824.

The previous prime is 12561091559. The next prime is 12561091601. The reversal of 12561091570 is 7519016521.

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 7 ways as a sum of consecutive naturals, for example, 28261 + ... + 160999.

It is an arithmetic number, because the mean of its divisors is an integer number (1413282780).

Almost surely, 2^12561091570 is an apocalyptic number.

12561091570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12561091570 is a deficient number, since it is larger than the sum of its proper divisors (10051432910).

12561091570 is a wasteful number, since it uses less digits than its factorization.

12561091570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142209.

The product of its (nonzero) digits is 18900, while the sum is 37.

The spelling of 12561091570 in words is "twelve billion, five hundred sixty-one million, ninety-one thousand, five hundred seventy".