161345497831 has 4 divisors (see below), whose sum is σ = 184394854672. Its totient is φ = 138296140992.

The previous prime is 161345497777. The next prime is 161345497879. The reversal of 161345497831 is 138794543161.

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 161345497831 - 2¹⁵ = 161345465063 is a prime.

It is a super-2 number, since 2×161345497831² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161345467831) 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, 11524678410 + ... + 11524678423.

It is an arithmetic number, because the mean of its divisors is an integer number (46098713668).

Almost surely, 2^161345497831 is an apocalyptic number.

161345497831 is a deficient number, since it is larger than the sum of its proper divisors (23049356841).

161345497831 is an equidigital number, since it uses as much as digits as its factorization.

161345497831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23049356840.

The product of its digits is 2177280, while the sum is 52.

The spelling of 161345497831 in words is "one hundred sixty-one billion, three hundred forty-five million, four hundred ninety-seven thousand, eight hundred thirty-one".