664801772076 has 36 divisors (see below), whose sum is σ = 1809738158592. Its totient is φ = 204554391264.

The previous prime is 664801772059. The next prime is 664801772093. The reversal of 664801772076 is 670277108466.

664801772076 is a `hidden beast` number, since 6 + 6 + 480 + 1 + 77 + 20 + 76 = 666.

It is an interprime number because it is at equal distance from previous prime (664801772059) and next prime (664801772093).

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

It is a super-2 number, since 2×664801772076² (a number of 24 digits) contains 22 as substring.

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, 710257836 + ... + 710258771.

Almost surely, 2^664801772076 is an apocalyptic number.

It is an amenable number.

664801772076 is an abundant number, since it is smaller than the sum of its proper divisors (1144936386516).

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

664801772076 is a wasteful number, since it uses less digits than its factorization.

664801772076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1420516630 (or 1420516625 counting only the distinct ones).

The product of its (nonzero) digits is 4741632, while the sum is 54.

The spelling of 664801772076 in words is "six hundred sixty-four billion, eight hundred one million, seven hundred seventy-two thousand, seventy-six".