66417501992 has 32 divisors (see below), whose sum is σ = 125524555200. Its totient is φ = 32944454400.

The previous prime is 66417501991. The next prime is 66417502009. The reversal of 66417501992 is 29910571466.

It is a super-2 number, since 2×66417501992² (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 66417501992.

It is not an unprimeable number, because it can be changed into a prime (66417501991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3888992 + ... + 3906032.

It is an arithmetic number, because the mean of its divisors is an integer number (3922642350).

Almost surely, 2^66417501992 is an apocalyptic number.

It is an amenable number.

66417501992 is a deficient number, since it is larger than the sum of its proper divisors (59107053208).

66417501992 is a wasteful number, since it uses less digits than its factorization.

66417501992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20897 (or 20893 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 50.

The spelling of 66417501992 in words is "sixty-six billion, four hundred seventeen million, five hundred one thousand, nine hundred ninety-two".