15540604551 has 24 divisors (see below), whose sum is σ = 22626938880. Its totient is φ = 10277932176.

The previous prime is 15540604481. The next prime is 15540604571.

15540604551 is a `hidden beast` number, since 1 + 5 + 5 + 40 + 60 + 4 + 551 = 666.

15540604551 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 15540604551 - 2¹⁰ = 15540603527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15540604571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 564730 + ... + 591608.

It is an arithmetic number, because the mean of its divisors is an integer number (942789120).

Almost surely, 2^15540604551 is an apocalyptic number.

15540604551 is a deficient number, since it is larger than the sum of its proper divisors (7086334329).

15540604551 is a wasteful number, since it uses less digits than its factorization.

15540604551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27395 (or 27392 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 36.

The spelling of 15540604551 in words is "fifteen billion, five hundred forty million, six hundred four thousand, five hundred fifty-one".