66629692665 has 16 divisors (see below), whose sum is σ = 118452787200. Its totient is φ = 35535836016.

The previous prime is 66629692637. The next prime is 66629692667. The reversal of 66629692665 is 56629692666.

It is not a de Polignac number, because 66629692665 - 2¹⁰ = 66629691641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66629692667) 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, 246776505 + ... + 246776774.

It is an arithmetic number, because the mean of its divisors is an integer number (7403299200).

Almost surely, 2^66629692665 is an apocalyptic number.

It is an amenable number.

66629692665 is a deficient number, since it is larger than the sum of its proper divisors (51823094535).

66629692665 is a wasteful number, since it uses less digits than its factorization.

66629692665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493553293 (or 493553287 counting only the distinct ones).

The product of its digits is 75582720, while the sum is 63.

Subtracting from 66629692665 its reverse (56629692666), we obtain a palindrome (9999999999).

The spelling of 66629692665 in words is "sixty-six billion, six hundred twenty-nine million, six hundred ninety-two thousand, six hundred sixty-five".