66817715627 has 8 divisors (see below), whose sum is σ = 72016878864. Its totient is φ = 61627029408.

The previous prime is 66817715599. The next prime is 66817715681. The reversal of 66817715627 is 72651771866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66817715627 - 2¹⁰ = 66817714603 is a prime.

It is a super-2 number, since 2×66817715627² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66817715687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2102873 + ... + 2134410.

It is an arithmetic number, because the mean of its divisors is an integer number (9002109858).

Almost surely, 2^66817715627 is an apocalyptic number.

66817715627 is a deficient number, since it is larger than the sum of its proper divisors (5199163237).

66817715627 is a wasteful number, since it uses less digits than its factorization.

66817715627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4238509.

The product of its digits is 5927040, while the sum is 56.

The spelling of 66817715627 in words is "sixty-six billion, eight hundred seventeen million, seven hundred fifteen thousand, six hundred twenty-seven".