66597686352 has 160 divisors (see below), whose sum is σ = 194025676800. Its totient is φ = 21867760512.

The previous prime is 66597686341. The next prime is 66597686399. The reversal of 66597686352 is 25368679566.

66597686352 is a `hidden beast` number, since 6 + 6 + 597 + 6 + 8 + 6 + 35 + 2 = 666.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 66597686352.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16618333 + ... + 16622339.

It is an arithmetic number, because the mean of its divisors is an integer number (1212660480).

Almost surely, 2^66597686352 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66597686352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97012838400).

66597686352 is an abundant number, since it is smaller than the sum of its proper divisors (127427990448).

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

66597686352 is a wasteful number, since it uses less digits than its factorization.

66597686352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4590 (or 4578 counting only the distinct ones).

The product of its digits is 97977600, while the sum is 63.

The spelling of 66597686352 in words is "sixty-six billion, five hundred ninety-seven million, six hundred eighty-six thousand, three hundred fifty-two".