669995493128 has 64 divisors (see below), whose sum is σ = 1375597762560. Its totient is φ = 304078150656.

The previous prime is 669995493119. The next prime is 669995493163. The reversal of 669995493128 is 821394599966.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1268051 + ... + 1716957.

It is an arithmetic number, because the mean of its divisors is an integer number (21493715040).

Almost surely, 2^669995493128 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 669995493128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (687798881280).

669995493128 is an abundant number, since it is smaller than the sum of its proper divisors (705602269432).

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

669995493128 is a wasteful number, since it uses less digits than its factorization.

669995493128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449166 (or 449162 counting only the distinct ones).

The product of its digits is 226748160, while the sum is 71.

The spelling of 669995493128 in words is "six hundred sixty-nine billion, nine hundred ninety-five million, four hundred ninety-three thousand, one hundred twenty-eight".