66733272775 has 24 divisors (see below), whose sum is σ = 89204401664. Its totient is φ = 49230288000.

The previous prime is 66733272737. The next prime is 66733272803. The reversal of 66733272775 is 57727233766.

It is a happy number.

It is not a de Polignac number, because 66733272775 - 2⁷ = 66733272647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 221050 + ... + 427000.

Almost surely, 2^66733272775 is an apocalyptic number.

66733272775 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

66733272775 is a deficient number, since it is larger than the sum of its proper divisors (22471128889).

66733272775 is a wasteful number, since it uses less digits than its factorization.

66733272775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206971 (or 206966 counting only the distinct ones).

The product of its digits is 15558480, while the sum is 55.

The spelling of 66733272775 in words is "sixty-six billion, seven hundred thirty-three million, two hundred seventy-two thousand, seven hundred seventy-five".