12015857860 has 48 divisors (see below), whose sum is σ = 25359188400. Its totient is φ = 4782417920.

The previous prime is 12015857807. The next prime is 12015857863. The reversal of 12015857860 is 6875851021.

It can be written as a sum of positive squares in 8 ways, for example, as 61496964 + 11954360896 = 7842^2 + 109336^2 .

It is a super-2 number, since 2×12015857860² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12015857863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6164166 + ... + 6166114.

It is an arithmetic number, because the mean of its divisors is an integer number (528316425).

Almost surely, 2^12015857860 is an apocalyptic number.

12015857860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12015857860 is an abundant number, since it is smaller than the sum of its proper divisors (13343330540).

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

12015857860 is a wasteful number, since it uses less digits than its factorization.

12015857860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3336 (or 3334 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 43.

The spelling of 12015857860 in words is "twelve billion, fifteen million, eight hundred fifty-seven thousand, eight hundred sixty".