55551556431 has 16 divisors (see below), whose sum is σ = 94055545600. Its totient is φ = 31743746424.

The previous prime is 55551556393. The next prime is 55551556439. The reversal of 55551556431 is 13465515555.

55551556431 is a `hidden beast` number, since 5 + 5 + 5 + 51 + 5 + 564 + 31 = 666.

It is not a de Polignac number, because 55551556431 - 2⁶ = 55551556367 is a prime.

It is a super-2 number, since 2×55551556431² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55551556439) 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, 146961601 + ... + 146961978.

It is an arithmetic number, because the mean of its divisors is an integer number (5878471600).

Almost surely, 2^55551556431 is an apocalyptic number.

55551556431 is a deficient number, since it is larger than the sum of its proper divisors (38503989169).

55551556431 is a wasteful number, since it uses less digits than its factorization.

55551556431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293923595 (or 293923589 counting only the distinct ones).

The product of its digits is 1125000, while the sum is 45.

The spelling of 55551556431 in words is "fifty-five billion, five hundred fifty-one million, five hundred fifty-six thousand, four hundred thirty-one".