667791870523983 has 10 divisors (see below), whose sum is σ = 997565633745824. Its totient is φ = 445194580349268.

The previous prime is 667791870523969. The next prime is 667791870524003. The reversal of 667791870523983 is 389325078197766.

667791870523983 is a `hidden beast` number, since 6 + 6 + 7 + 7 + 9 + 1 + 8 + 7 + 0 + 523 + 9 + 83 = 666.

It is not a de Polignac number, because 667791870523983 - 2⁴⁸ = 386316893813327 is a prime.

It is a super-2 number, since 2×667791870523983² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (81), and also a Moran number because the ratio is a prime number: 8244344080543 = 667791870523983 / (6 + 6 + 7 + 7 + 9 + 1 + 8 + 7 + 0 + 5 + 2 + 3 + 9 + 8 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667791870523963) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4122172040191 + ... + 4122172040352.

Almost surely, 2^{667791870523983} is an apocalyptic number.

667791870523983 is a deficient number, since it is larger than the sum of its proper divisors (329773763221841).

667791870523983 is an equidigital number, since it uses as much as digits as its factorization.

667791870523983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8244344080555 (or 8244344080546 counting only the distinct ones).

The product of its (nonzero) digits is 5761082880, while the sum is 81.

The spelling of 667791870523983 in words is "six hundred sixty-seven trillion, seven hundred ninety-one billion, eight hundred seventy million, five hundred twenty-three thousand, nine hundred eighty-three".