12866977540 has 12 divisors (see below), whose sum is σ = 27020652876. Its totient is φ = 5146791008.

The previous prime is 12866977511. The next prime is 12866977597. The reversal of 12866977540 is 4577966821.

It can be written as a sum of positive squares in 2 ways, for example, as 3228057856 + 9638919684 = 56816^2 + 98178^2 .

It is a super-2 number, since 2×12866977540² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 321674419 + ... + 321674458.

It is an arithmetic number, because the mean of its divisors is an integer number (2251721073).

Almost surely, 2^12866977540 is an apocalyptic number.

12866977540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12866977540 is an abundant number, since it is smaller than the sum of its proper divisors (14153675336).

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

12866977540 is a wasteful number, since it uses less digits than its factorization.

12866977540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643348886 (or 643348884 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 55.

The spelling of 12866977540 in words is "twelve billion, eight hundred sixty-six million, nine hundred seventy-seven thousand, five hundred forty".