161860281516631 has 2 divisors, whose sum is σ = 161860281516632. Its totient is φ = 161860281516630.

The previous prime is 161860281516607. The next prime is 161860281516649. The reversal of 161860281516631 is 136615182068161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161860281516631 - 2⁴³ = 153064188494423 is a prime.

It is a super-2 number, since 2×161860281516631² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161860281526631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80930140758315 + 80930140758316.

It is an arithmetic number, because the mean of its divisors is an integer number (80930140758316).

Almost surely, 2^{161860281516631} is an apocalyptic number.

161860281516631 is a deficient number, since it is larger than the sum of its proper divisors (1).

161860281516631 is an equidigital number, since it uses as much as digits as its factorization.

161860281516631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2488320, while the sum is 55.

The spelling of 161860281516631 in words is "one hundred sixty-one trillion, eight hundred sixty billion, two hundred eighty-one million, five hundred sixteen thousand, six hundred thirty-one".