161017668 has 36 divisors (see below), whose sum is σ = 465162880. Its totient is φ = 46004976.

The previous prime is 161017651. The next prime is 161017709. The reversal of 161017668 is 866710161.

161017668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 319228 + ... + 319731.

Almost surely, 2^161017668 is an apocalyptic number.

161017668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

161017668 is an abundant number, since it is smaller than the sum of its proper divisors (304145212).

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

161017668 is a wasteful number, since it uses less digits than its factorization.

161017668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638976 (or 638971 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 161017668 is about 12689.2737380829. The cubic root of 161017668 is about 544.0320816215.

The spelling of 161017668 in words is "one hundred sixty-one million, seventeen thousand, six hundred sixty-eight".