12664949991 has 16 divisors (see below), whose sum is σ = 17277132288. Its totient is φ = 8249868000.

The previous prime is 12664949951. The next prime is 12664949993. The reversal of 12664949991 is 19994946621.

It is not a de Polignac number, because 12664949991 - 2⁷ = 12664949863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12664949993) 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, 201531 + ... + 256796.

It is an arithmetic number, because the mean of its divisors is an integer number (1079820768).

Almost surely, 2^12664949991 is an apocalyptic number.

12664949991 is a deficient number, since it is larger than the sum of its proper divisors (4612182297).

12664949991 is a wasteful number, since it uses less digits than its factorization.

12664949991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458542.

The product of its digits is 7558272, while the sum is 60.

The spelling of 12664949991 in words is "twelve billion, six hundred sixty-four million, nine hundred forty-nine thousand, nine hundred ninety-one".