12999491551 has 8 divisors (see below), whose sum is σ = 13303727360. Its totient is φ = 12695343192.

The previous prime is 12999491543. The next prime is 12999491591. The reversal of 12999491551 is 15519499921.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12999491551 - 2³ = 12999491543 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12999491492 and 12999491501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12999491501) 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, 353260 + ... + 388318.

It is an arithmetic number, because the mean of its divisors is an integer number (1662965920).

Almost surely, 2^12999491551 is an apocalyptic number.

12999491551 is a deficient number, since it is larger than the sum of its proper divisors (304235809).

12999491551 is an equidigital number, since it uses as much as digits as its factorization.

12999491551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43725.

The product of its digits is 1312200, while the sum is 55.

The spelling of 12999491551 in words is "twelve billion, nine hundred ninety-nine million, four hundred ninety-one thousand, five hundred fifty-one".