12157861810 has 16 divisors (see below), whose sum is σ = 22242908952. Its totient is φ = 4783420800.

The previous prime is 12157861747. The next prime is 12157861813. The reversal of 12157861810 is 1816875121.

It can be written as a sum of positive squares in 4 ways, for example, as 2940133729 + 9217728081 = 54223^2 + 96009^2 .

It is a super-2 number, since 2×12157861810² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12157861813) by changing a digit.

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, 9964851 + ... + 9966070.

Almost surely, 2^12157861810 is an apocalyptic number.

12157861810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12157861810 is a deficient number, since it is larger than the sum of its proper divisors (10085047142).

12157861810 is a wasteful number, since it uses less digits than its factorization.

12157861810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19930989.

The product of its (nonzero) digits is 26880, while the sum is 40.

The spelling of 12157861810 in words is "twelve billion, one hundred fifty-seven million, eight hundred sixty-one thousand, eight hundred ten".