664120034640 has 80 divisors (see below), whose sum is σ = 2287524571200. Its totient is φ = 177098675328.

The previous prime is 664120034573. The next prime is 664120034687. The reversal of 664120034640 is 46430021466.

664120034640 is a `hidden beast` number, since 6 + 6 + 4 + 1 + 2 + 0 + 0 + 3 + 4 + 640 = 666.

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 (36).

It is a junction number, because it is equal to n+sod(n) for n = 664120034595 and 664120034604.

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, 153729330 + ... + 153733649.

It is an arithmetic number, because the mean of its divisors is an integer number (28594057140).

Almost surely, 2^664120034640 is an apocalyptic number.

664120034640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

664120034640 is an abundant number, since it is smaller than the sum of its proper divisors (1623404536560).

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

664120034640 is a wasteful number, since it uses less digits than its factorization.

664120034640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307463001 (or 307462989 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The spelling of 664120034640 in words is "six hundred sixty-four billion, one hundred twenty million, thirty-four thousand, six hundred forty".