664161000 has 128 divisors (see below), whose sum is σ = 2082412800. Its totient is φ = 176236800.

The previous prime is 664160977. The next prime is 664161031. The reversal of 664161000 is 161466.

664161000 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 2×664161000² = 882219667842000000, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 806589 + ... + 807411.

It is an arithmetic number, because the mean of its divisors is an integer number (16268850).

Almost surely, 2^664161000 is an apocalyptic number.

664161000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664161000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1041206400).

664161000 is an abundant number, since it is smaller than the sum of its proper divisors (1418251800).

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

664161000 is a wasteful number, since it uses less digits than its factorization.

664161000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116 (or 1102 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 664161000 is about 25771.3212699698. The cubic root of 664161000 is about 872.4846399761.

The spelling of 664161000 in words is "six hundred sixty-four million, one hundred sixty-one thousand".