664578654160 has 40 divisors (see below), whose sum is σ = 1546841638656. Its totient is φ = 265539630720.

The previous prime is 664578654127. The next prime is 664578654163. The reversal of 664578654160 is 61456875466.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 664578654095 and 664578654104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664578654163) 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, 4486524 + ... + 4632283.

Almost surely, 2^664578654160 is an apocalyptic number.

It is an amenable number.

664578654160 is an abundant number, since it is smaller than the sum of its proper divisors (882262984496).

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

664578654160 is a wasteful number, since it uses less digits than its factorization.

664578654160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9119731 (or 9119725 counting only the distinct ones).

The product of its (nonzero) digits is 29030400, while the sum is 58.

The spelling of 664578654160 in words is "six hundred sixty-four billion, five hundred seventy-eight million, six hundred fifty-four thousand, one hundred sixty".