664701447547422 has 80 divisors (see below), whose sum is σ = 1508311717228800. Its totient is φ = 218757477528720.

The previous prime is 664701447547369. The next prime is 664701447547447. The reversal of 664701447547422 is 224745744107466.

664701447547422 is a `hidden beast` number, since 6 + 6 + 4 + 7 + 0 + 1 + 4 + 47 + 547 + 42 + 2 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 664701447547422.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 578650897 + ... + 579798467.

It is an arithmetic number, because the mean of its divisors is an integer number (18853896465360).

Almost surely, 2^{664701447547422} is an apocalyptic number.

664701447547422 is an abundant number, since it is smaller than the sum of its proper divisors (843610269681378).

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

664701447547422 is a wasteful number, since it uses less digits than its factorization.

664701447547422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192923 (or 1192914 counting only the distinct ones).

The product of its (nonzero) digits is 252887040, while the sum is 63.

The spelling of 664701447547422 in words is "six hundred sixty-four trillion, seven hundred one billion, four hundred forty-seven million, five hundred forty-seven thousand, four hundred twenty-two".