161013640 has 32 divisors (see below), whose sum is σ = 372075480. Its totient is φ = 62664192.

The previous prime is 161013637. The next prime is 161013641. The reversal of 161013640 is 46310161.

It is a happy number.

161013640 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 156200004 + 4813636 = 12498^2 + 2194^2 .

It is not an unprimeable number, because it can be changed into a prime (161013641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52917 + ... + 55876.

Almost surely, 2^161013640 is an apocalyptic number.

161013640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161013640 is an abundant number, since it is smaller than the sum of its proper divisors (211061840).

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

161013640 is a wasteful number, since it uses less digits than its factorization.

161013640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108841 (or 108837 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 161013640 is about 12689.1150203629. The cubic root of 161013640 is about 544.0275451018.

The spelling of 161013640 in words is "one hundred sixty-one million, thirteen thousand, six hundred forty".