55216040431 has 2 divisors, whose sum is σ = 55216040432. Its totient is φ = 55216040430.

The previous prime is 55216040423. The next prime is 55216040471. The reversal of 55216040431 is 13404061255.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55216040431 - 2³ = 55216040423 is a prime.

It is a super-2 number, since 2×55216040431² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55216040393 and 55216040402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55216040401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27608020215 + 27608020216.

It is an arithmetic number, because the mean of its divisors is an integer number (27608020216).

Almost surely, 2^55216040431 is an apocalyptic number.

55216040431 is a deficient number, since it is larger than the sum of its proper divisors (1).

55216040431 is an equidigital number, since it uses as much as digits as its factorization.

55216040431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 31.

The spelling of 55216040431 in words is "fifty-five billion, two hundred sixteen million, forty thousand, four hundred thirty-one".