667882700081 has 4 divisors (see below), whose sum is σ = 667884360192. Its totient is φ = 667881039972.

The previous prime is 667882700071. The next prime is 667882700143. The reversal of 667882700081 is 180007288766.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667882700081 is a prime.

It is a super-2 number, since 2×667882700081² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 667882699996 and 667882700032.

It is not an unprimeable number, because it can be changed into a prime (667882700021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197096 + ... + 1172438.

It is an arithmetic number, because the mean of its divisors is an integer number (166971090048).

Almost surely, 2^667882700081 is an apocalyptic number.

It is an amenable number.

667882700081 is a deficient number, since it is larger than the sum of its proper divisors (1660111).

667882700081 is an equidigital number, since it uses as much as digits as its factorization.

667882700081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1660110.

The product of its (nonzero) digits is 1806336, while the sum is 53.

The spelling of 667882700081 in words is "six hundred sixty-seven billion, eight hundred eighty-two million, seven hundred thousand, eighty-one".