664155140 has 48 divisors (see below), whose sum is σ = 1523902464. Its totient is φ = 241132800.

The previous prime is 664155139. The next prime is 664155157. The reversal of 664155140 is 41551466.

It is a super-2 number, since 2×664155140² = 882204099976839200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 664155097 and 664155106.

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, 165437 + ... + 169403.

It is an arithmetic number, because the mean of its divisors is an integer number (31747968).

Almost surely, 2^664155140 is an apocalyptic number.

It is an amenable number.

664155140 is an abundant number, since it is smaller than the sum of its proper divisors (859747324).

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

664155140 is a wasteful number, since it uses less digits than its factorization.

664155140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4748 (or 4746 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 664155140 is about 25771.2075774497. The cubic root of 664155140 is about 872.4820739442.

It can be divided in two parts, 6 and 64155140, that added together give a palindrome (64155146).

The spelling of 664155140 in words is "six hundred sixty-four million, one hundred fifty-five thousand, one hundred forty".