161845358632931 has 4 divisors (see below), whose sum is σ = 162365761715664. Its totient is φ = 161324955550200.

The previous prime is 161845358632897. The next prime is 161845358632949. The reversal of 161845358632931 is 139236853548161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161845358632931 - 2⁴⁶ = 91476614455267 is a prime.

It is a super-2 number, since 2×161845358632931² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161845358632961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260201540900 + ... + 260201541521.

It is an arithmetic number, because the mean of its divisors is an integer number (40591440428916).

Almost surely, 2^{161845358632931} is an apocalyptic number.

161845358632931 is a deficient number, since it is larger than the sum of its proper divisors (520403082733).

161845358632931 is an equidigital number, since it uses as much as digits as its factorization.

161845358632931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520403082732.

The product of its digits is 111974400, while the sum is 65.

The spelling of 161845358632931 in words is "one hundred sixty-one trillion, eight hundred forty-five billion, three hundred fifty-eight million, six hundred thirty-two thousand, nine hundred thirty-one".