55420440431 has 2 divisors, whose sum is σ = 55420440432. Its totient is φ = 55420440430.

The previous prime is 55420440391. The next prime is 55420440443. The reversal of 55420440431 is 13404402455.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55420440431 - 2²⁶ = 55353331567 is a prime.

It is a super-2 number, since 2×55420440431² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55420440731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27710220215 + 27710220216.

It is an arithmetic number, because the mean of its divisors is an integer number (27710220216).

Almost surely, 2^55420440431 is an apocalyptic number.

55420440431 is a deficient number, since it is larger than the sum of its proper divisors (1).

55420440431 is an equidigital number, since it uses as much as digits as its factorization.

55420440431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38400, while the sum is 32.

Adding to 55420440431 its reverse (13404402455), we get a palindrome (68824842886).

The spelling of 55420440431 in words is "fifty-five billion, four hundred twenty million, four hundred forty thousand, four hundred thirty-one".