55431162161 has 2 divisors, whose sum is σ = 55431162162. Its totient is φ = 55431162160.

The previous prime is 55431162133. The next prime is 55431162239. The reversal of 55431162161 is 16126113455.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41384171761 + 14046990400 = 203431^2 + 118520^2 .

It is a cyclic number.

It is not a de Polignac number, because 55431162161 - 2¹⁸ = 55430900017 is a prime.

It is a super-2 number, since 2×55431162161² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55431161161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27715581080 + 27715581081.

It is an arithmetic number, because the mean of its divisors is an integer number (27715581081).

Almost surely, 2^55431162161 is an apocalyptic number.

It is an amenable number.

55431162161 is a deficient number, since it is larger than the sum of its proper divisors (1).

55431162161 is an equidigital number, since it uses as much as digits as its factorization.

55431162161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 35.

The spelling of 55431162161 in words is "fifty-five billion, four hundred thirty-one million, one hundred sixty-two thousand, one hundred sixty-one".