669928154544 has 160 divisors (see below), whose sum is σ = 2107165132800. Its totient is φ = 202097859840.

The previous prime is 669928154531. The next prime is 669928154591. The reversal of 669928154544 is 445451829966.

669928154544 is a `hidden beast` number, since 6 + 6 + 9 + 9 + 2 + 81 + 5 + 4 + 544 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 743602 + ... + 1375790.

It is an arithmetic number, because the mean of its divisors is an integer number (13169782080).

Almost surely, 2^669928154544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669928154544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1053582566400).

669928154544 is an abundant number, since it is smaller than the sum of its proper divisors (1437236978256).

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

669928154544 is a wasteful number, since it uses less digits than its factorization.

669928154544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632440 (or 632428 counting only the distinct ones).

The product of its digits is 74649600, while the sum is 63.

The spelling of 669928154544 in words is "six hundred sixty-nine billion, nine hundred twenty-eight million, one hundred fifty-four thousand, five hundred forty-four".