161566433868 has 48 divisors (see below), whose sum is σ = 432314346240. Its totient is φ = 46004282304.

The previous prime is 161566433851. The next prime is 161566433887. The reversal of 161566433868 is 868334665161.

It is a super-2 number, since 2×161566433868² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3257658 + ... + 3306881.

It is an arithmetic number, because the mean of its divisors is an integer number (9006548880).

Almost surely, 2^161566433868 is an apocalyptic number.

It is an amenable number.

161566433868 is an abundant number, since it is smaller than the sum of its proper divisors (270747912372).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161566433868 is a wasteful number, since it uses less digits than its factorization.

161566433868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6564846 (or 6564844 counting only the distinct ones).

The product of its digits is 14929920, while the sum is 57.

The spelling of 161566433868 in words is "one hundred sixty-one billion, five hundred sixty-six million, four hundred thirty-three thousand, eight hundred sixty-eight".