66697673667 has 16 divisors (see below), whose sum is σ = 90077391360. Its totient is φ = 43894548000.

The previous prime is 66697673641. The next prime is 66697673671. The reversal of 66697673667 is 76637679666.

It is not a de Polignac number, because 66697673667 - 2¹⁵ = 66697640899 is a prime.

It is a super-4 number, since 4×66697673667⁴ (a number of 44 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (66697673167) 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, 287709 + ... + 464942.

It is an arithmetic number, because the mean of its divisors is an integer number (5629836960).

Almost surely, 2^66697673667 is an apocalyptic number.

66697673667 is a deficient number, since it is larger than the sum of its proper divisors (23379717693).

66697673667 is a wasteful number, since it uses less digits than its factorization.

66697673667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753034.

The product of its digits is 432081216, while the sum is 69.

The spelling of 66697673667 in words is "sixty-six billion, six hundred ninety-seven million, six hundred seventy-three thousand, six hundred sixty-seven".