669481082964721 has 4 divisors (see below), whose sum is σ = 669481140985200. Its totient is φ = 669481024944244.

The previous prime is 669481082964709. The next prime is 669481082964731. The reversal of 669481082964721 is 127469280184966.

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 not a de Polignac number, because 669481082964721 - 2²³ = 669481074576113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669481082964731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5173651 + ... + 36955768.

It is an arithmetic number, because the mean of its divisors is an integer number (167370285246300).

Almost surely, 2^{669481082964721} is an apocalyptic number.

It is an amenable number.

669481082964721 is a deficient number, since it is larger than the sum of its proper divisors (58020479).

669481082964721 is a wasteful number, since it uses less digits than its factorization.

669481082964721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58020478.

The product of its (nonzero) digits is 501645312, while the sum is 73.

The spelling of 669481082964721 in words is "six hundred sixty-nine trillion, four hundred eighty-one billion, eighty-two million, nine hundred sixty-four thousand, seven hundred twenty-one".