66974621598 has 24 divisors (see below), whose sum is σ = 145762413888. Its totient is φ = 22224760992.

The previous prime is 66974621573. The next prime is 66974621599. The reversal of 66974621598 is 89512647966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66974621599) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8338615 + ... + 8346642.

It is an arithmetic number, because the mean of its divisors is an integer number (6073433912).

Almost surely, 2^66974621598 is an apocalyptic number.

66974621598 is an abundant number, since it is smaller than the sum of its proper divisors (78787792290).

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

66974621598 is a wasteful number, since it uses less digits than its factorization.

66974621598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16685488 (or 16685485 counting only the distinct ones).

The product of its digits is 39191040, while the sum is 63.

The spelling of 66974621598 in words is "sixty-six billion, nine hundred seventy-four million, six hundred twenty-one thousand, five hundred ninety-eight".