15543664451 has 16 divisors (see below), whose sum is σ = 18812445696. Its totient is φ = 12537223296.

The previous prime is 15543664387. The next prime is 15543664463. The reversal of 15543664451 is 15446634551.

It is a cyclic number.

It is not a de Polignac number, because 15543664451 - 2⁶ = 15543664387 is a prime.

It is a super-2 number, since 2×15543664451² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15543664471) 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, 1234550 + ... + 1247076.

It is an arithmetic number, because the mean of its divisors is an integer number (1175777856).

Almost surely, 2^15543664451 is an apocalyptic number.

15543664451 is a deficient number, since it is larger than the sum of its proper divisors (3268781245).

15543664451 is a wasteful number, since it uses less digits than its factorization.

15543664451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22978.

The product of its digits is 864000, while the sum is 44.

The spelling of 15543664451 in words is "fifteen billion, five hundred forty-three million, six hundred sixty-four thousand, four hundred fifty-one".