161961960 has 32 divisors (see below), whose sum is σ = 485886240. Its totient is φ = 43189824.

The previous prime is 161961923. The next prime is 161961971. The reversal of 161961960 is 69169161.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 674722 + ... + 674961.

It is an arithmetic number, because the mean of its divisors is an integer number (15183945).

Almost surely, 2^161961960 is an apocalyptic number.

161961960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161961960 is an abundant number, since it is smaller than the sum of its proper divisors (323924280).

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

161961960 is a wasteful number, since it uses less digits than its factorization.

161961960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1349697 (or 1349693 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 161961960 is about 12726.4276212926. The cubic root of 161961960 is about 545.0935058259.

The spelling of 161961960 in words is "one hundred sixty-one million, nine hundred sixty-one thousand, nine hundred sixty".