161366140531 has 2 divisors, whose sum is σ = 161366140532. Its totient is φ = 161366140530.

The previous prime is 161366140511. The next prime is 161366140543. The reversal of 161366140531 is 135041663161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161366140531 - 2⁵ = 161366140499 is a prime.

It is a super-2 number, since 2×161366140531² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161366140511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80683070265 + 80683070266.

It is an arithmetic number, because the mean of its divisors is an integer number (80683070266).

Almost surely, 2^161366140531 is an apocalyptic number.

161366140531 is a deficient number, since it is larger than the sum of its proper divisors (1).

161366140531 is an equidigital number, since it uses as much as digits as its factorization.

161366140531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 37.

The spelling of 161366140531 in words is "one hundred sixty-one billion, three hundred sixty-six million, one hundred forty thousand, five hundred thirty-one".