669622405680 has 120 divisors (see below), whose sum is σ = 2332104766992. Its totient is φ = 178565969664.

The previous prime is 669622405667. The next prime is 669622405687. The reversal of 669622405680 is 86504226966.

It is a happy number.

669622405680 is a `hidden beast` number, since 6 + 6 + 9 + 622 + 4 + 0 + 5 + 6 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (669622405687) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17203359 + ... + 17242238.

Almost surely, 2^669622405680 is an apocalyptic number.

669622405680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

669622405680 is an abundant number, since it is smaller than the sum of its proper divisors (1662482361312).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669622405680 is a wasteful number, since it uses less digits than its factorization.

669622405680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34445625 (or 34445607 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 54.

The spelling of 669622405680 in words is "six hundred sixty-nine billion, six hundred twenty-two million, four hundred five thousand, six hundred eighty".