161643460 has 24 divisors (see below), whose sum is σ = 370310976. Its totient is φ = 58779360.

The previous prime is 161643457. The next prime is 161643467. The reversal of 161643460 is 64346161.

161643460 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161643460² = 52257216321543200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161643467) 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, 367152 + ... + 367591.

It is an arithmetic number, because the mean of its divisors is an integer number (15429624).

Almost surely, 2^161643460 is an apocalyptic number.

161643460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161643460 is an abundant number, since it is smaller than the sum of its proper divisors (208667516).

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

161643460 is a wasteful number, since it uses less digits than its factorization.

161643460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734763 (or 734761 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 161643460 is about 12713.9081324351. The cubic root of 161643460 is about 544.7359605324.

The spelling of 161643460 in words is "one hundred sixty-one million, six hundred forty-three thousand, four hundred sixty".