161134640 has 20 divisors (see below), whose sum is σ = 374638224. Its totient is φ = 64453824.

The previous prime is 161134627. The next prime is 161134651. The reversal of 161134640 is 46431161.

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1007012 + ... + 1007171.

Almost surely, 2^161134640 is an apocalyptic number.

161134640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161134640 is an abundant number, since it is smaller than the sum of its proper divisors (213503584).

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

161134640 is a wasteful number, since it uses less digits than its factorization.

161134640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2014196 (or 2014190 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 161134640 is about 12693.8819909435. The cubic root of 161134640 is about 544.1637879077.

The spelling of 161134640 in words is "one hundred sixty-one million, one hundred thirty-four thousand, six hundred forty".