161510640 has 80 divisors (see below), whose sum is σ = 527049600. Its totient is φ = 40801536.

The previous prime is 161510627. The next prime is 161510653. The reversal of 161510640 is 46015161.

It is an interprime number because it is at equal distance from previous prime (161510627) and next prime (161510653).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 161510640.

It is a congruent number.

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, 13150 + ... + 22269.

It is an arithmetic number, because the mean of its divisors is an integer number (6588120).

Almost surely, 2^161510640 is an apocalyptic number.

161510640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161510640 is an abundant number, since it is smaller than the sum of its proper divisors (365538960).

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

161510640 is a wasteful number, since it uses less digits than its factorization.

161510640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35454 (or 35448 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 161510640 is about 12708.6836454450. The cubic root of 161510640 is about 544.5867191998.

The spelling of 161510640 in words is "one hundred sixty-one million, five hundred ten thousand, six hundred forty".