66630539635 has 16 divisors (see below), whose sum is σ = 90233209440. Its totient is φ = 46787587840.

The previous prime is 66630539627. The next prime is 66630539639. The reversal of 66630539635 is 53693503666.

It is a happy number.

It is not a de Polignac number, because 66630539635 - 2³ = 66630539627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66630539639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20885722 + ... + 20888911.

It is an arithmetic number, because the mean of its divisors is an integer number (5639575590).

Almost surely, 2^66630539635 is an apocalyptic number.

66630539635 is a deficient number, since it is larger than the sum of its proper divisors (23602669805).

66630539635 is a wasteful number, since it uses less digits than its factorization.

66630539635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41774678.

The product of its (nonzero) digits is 7873200, while the sum is 52.

The spelling of 66630539635 in words is "sixty-six billion, six hundred thirty million, five hundred thirty-nine thousand, six hundred thirty-five".