15312661551 has 64 divisors (see below), whose sum is σ = 25334000640. Its totient is φ = 9063083520.

The previous prime is 15312661547. The next prime is 15312661589. The reversal of 15312661551 is 15516621351.

15312661551 is a `hidden beast` number, since 1 + 5 + 31 + 2 + 6 + 615 + 5 + 1 = 666.

15312661551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 15312661551 - 2² = 15312661547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15312661541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2229715 + ... + 2236571.

It is an arithmetic number, because the mean of its divisors is an integer number (395843760).

Almost surely, 2^15312661551 is an apocalyptic number.

15312661551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

15312661551 is a deficient number, since it is larger than the sum of its proper divisors (10021339089).

15312661551 is a wasteful number, since it uses less digits than its factorization.

15312661551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7053 (or 7047 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The spelling of 15312661551 in words is "fifteen billion, three hundred twelve million, six hundred sixty-one thousand, five hundred fifty-one".