66017870625 has 40 divisors (see below), whose sum is σ = 125708110528. Its totient is φ = 30179592000.

The previous prime is 66017870621. The next prime is 66017870627. The reversal of 66017870625 is 52607871066.

It is not a de Polignac number, because 66017870625 - 2² = 66017870621 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66017870621) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2501842 + ... + 2528091.

Almost surely, 2^66017870625 is an apocalyptic number.

It is an amenable number.

66017870625 is a deficient number, since it is larger than the sum of its proper divisors (59690239903).

66017870625 is an equidigital number, since it uses as much as digits as its factorization.

66017870625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5029963 (or 5029948 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 48.

The spelling of 66017870625 in words is "sixty-six billion, seventeen million, eight hundred seventy thousand, six hundred twenty-five".