12699889540 has 24 divisors (see below), whose sum is σ = 28721289240. Its totient is φ = 4689189888.

The previous prime is 12699889537. The next prime is 12699889547. The reversal of 12699889540 is 4598899621.

It can be written as a sum of positive squares in 4 ways, for example, as 120472576 + 12579416964 = 10976^2 + 112158^2 .

It is a super-2 number, since 2×12699889540² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12699889547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24422605 + ... + 24423124.

It is an arithmetic number, because the mean of its divisors is an integer number (1196720385).

Almost surely, 2^12699889540 is an apocalyptic number.

12699889540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12699889540 is an abundant number, since it is smaller than the sum of its proper divisors (16021399700).

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

12699889540 is a wasteful number, since it uses less digits than its factorization.

12699889540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48845751 (or 48845749 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 61.

The spelling of 12699889540 in words is "twelve billion, six hundred ninety-nine million, eight hundred eighty-nine thousand, five hundred forty".