66794060664 has 96 divisors (see below), whose sum is σ = 195996406320. Its totient is φ = 20467657728.

The previous prime is 66794060653. The next prime is 66794060699. The reversal of 66794060664 is 46606049766.

It is a super-2 number, since 2×66794060664² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66794060664.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 581907 + ... + 687170.

Almost surely, 2^66794060664 is an apocalyptic number.

It is an amenable number.

66794060664 is an abundant number, since it is smaller than the sum of its proper divisors (129202345656).

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

66794060664 is a wasteful number, since it uses less digits than its factorization.

66794060664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1269149 (or 1269142 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 54.

The spelling of 66794060664 in words is "sixty-six billion, seven hundred ninety-four million, sixty thousand, six hundred sixty-four".