15546664551 has 96 divisors (see below), whose sum is σ = 24860828160. Its totient is φ = 8610243840.

The previous prime is 15546664501. The next prime is 15546664561.

15546664551 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 15546664551 - 2¹⁵ = 15546631783 is a prime.

It is a super-2 number, since 2×15546664551² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15546664551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15546664501) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 18225441 + ... + 18226293.

It is an arithmetic number, because the mean of its divisors is an integer number (258966960).

Almost surely, 2^15546664551 is an apocalyptic number.

15546664551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

15546664551 is a deficient number, since it is larger than the sum of its proper divisors (9314163609).

15546664551 is a wasteful number, since it uses less digits than its factorization.

15546664551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997 (or 986 counting only the distinct ones).

The product of its digits is 2160000, while the sum is 48.

The spelling of 15546664551 in words is "fifteen billion, five hundred forty-six million, six hundred sixty-four thousand, five hundred fifty-one".