15550504431 has 32 divisors (see below), whose sum is σ = 26005045248. Its totient is φ = 8029791840.

The previous prime is 15550504369. The next prime is 15550504433. The reversal of 15550504431 is 13440505551.

It is not a de Polignac number, because 15550504431 - 2¹⁰ = 15550503407 is a prime.

It is a super-2 number, since 2×15550504431² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 15550504392 and 15550504401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15550504433) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 162975 + ... + 240128.

It is an arithmetic number, because the mean of its divisors is an integer number (812657664).

Almost surely, 2^15550504431 is an apocalyptic number.

15550504431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

15550504431 is a deficient number, since it is larger than the sum of its proper divisors (10454540817).

15550504431 is a wasteful number, since it uses less digits than its factorization.

15550504431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403291.

The product of its (nonzero) digits is 30000, while the sum is 33.

The spelling of 15550504431 in words is "fifteen billion, five hundred fifty million, five hundred four thousand, four hundred thirty-one".