55120015431 has 16 divisors (see below), whose sum is σ = 87940765920. Its totient is φ = 33920009280.

The previous prime is 55120015429. The next prime is 55120015441. The reversal of 55120015431 is 13451002155.

It is not a de Polignac number, because 55120015431 - 2¹ = 55120015429 is a prime.

It is a super-2 number, since 2×55120015431² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 55120015395 and 55120015404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55120015421) 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 15 ways as a sum of consecutive naturals, for example, 78518190 + ... + 78518891.

It is an arithmetic number, because the mean of its divisors is an integer number (5496297870).

Almost surely, 2^55120015431 is an apocalyptic number.

55120015431 is a deficient number, since it is larger than the sum of its proper divisors (32820750489).

55120015431 is a wasteful number, since it uses less digits than its factorization.

55120015431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157037103 (or 157037097 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

Adding to 55120015431 its reverse (13451002155), we get a palindrome (68571017586).

The spelling of 55120015431 in words is "fifty-five billion, one hundred twenty million, fifteen thousand, four hundred thirty-one".