12866087731 has 24 divisors (see below), whose sum is σ = 15291533184. Its totient is φ = 10790599680.

The previous prime is 12866087723. The next prime is 12866087753. The reversal of 12866087731 is 13778066821.

It is a happy number.

It is not a de Polignac number, because 12866087731 - 2³ = 12866087723 is a prime.

It is a super-2 number, since 2×12866087731² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12866087791) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 565726 + ... + 588028.

It is an arithmetic number, because the mean of its divisors is an integer number (637147216).

Almost surely, 2^12866087731 is an apocalyptic number.

12866087731 is a deficient number, since it is larger than the sum of its proper divisors (2425445453).

12866087731 is a wasteful number, since it uses less digits than its factorization.

12866087731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22571 (or 22564 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 49.

The spelling of 12866087731 in words is "twelve billion, eight hundred sixty-six million, eighty-seven thousand, seven hundred thirty-one".