664447074798480 has 40 divisors (see below), whose sum is σ = 2059785931876032. Its totient is φ = 177185886612864.

The previous prime is 664447074798449. The next prime is 664447074798503. The reversal of 664447074798480 is 84897470744466.

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

It is a super-2 number, since 2×664447074798480² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 664447074798396 and 664447074798405.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1384264738924 + ... + 1384264739403.

Almost surely, 2^{664447074798480} is an apocalyptic number.

664447074798480 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

664447074798480 is an abundant number, since it is smaller than the sum of its proper divisors (1395338857077552).

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

664447074798480 is a wasteful number, since it uses less digits than its factorization.

664447074798480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2768529478343 (or 2768529478337 counting only the distinct ones).

The product of its (nonzero) digits is 7283146752, while the sum is 78.

The spelling of 664447074798480 in words is "six hundred sixty-four trillion, four hundred forty-seven billion, seventy-four million, seven hundred ninety-eight thousand, four hundred eighty".