669251964054 has 32 divisors (see below), whose sum is σ = 1382484040704. Its totient is φ = 215762329440.

The previous prime is 669251964049. The next prime is 669251964079. The reversal of 669251964054 is 450469152966.

It is a super-2 number, since 2×669251964054² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 669251963985 and 669251964003.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 723669 + ... + 1364624.

It is an arithmetic number, because the mean of its divisors is an integer number (43202626272).

Almost surely, 2^669251964054 is an apocalyptic number.

669251964054 is an abundant number, since it is smaller than the sum of its proper divisors (713232076650).

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

669251964054 is a wasteful number, since it uses less digits than its factorization.

669251964054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2090052.

The product of its (nonzero) digits is 13996800, while the sum is 57.

The spelling of 669251964054 in words is "six hundred sixty-nine billion, two hundred fifty-one million, nine hundred sixty-four thousand, fifty-four".