665701950472 has 128 divisors (see below), whose sum is σ = 1427842483200. Its totient is φ = 288649101312.

The previous prime is 665701950461. The next prime is 665701950509. The reversal of 665701950472 is 274059107566.

It is a Harshad number since it is a multiple of its sum of digits (52).

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, 36461698 + ... + 36479950.

It is an arithmetic number, because the mean of its divisors is an integer number (11155019400).

Almost surely, 2^665701950472 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 665701950472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (713921241600).

665701950472 is an abundant number, since it is smaller than the sum of its proper divisors (762140532728).

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

665701950472 is a wasteful number, since it uses less digits than its factorization.

665701950472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18567 (or 18563 counting only the distinct ones).

The product of its (nonzero) digits is 3175200, while the sum is 52.

The spelling of 665701950472 in words is "six hundred sixty-five billion, seven hundred one million, nine hundred fifty thousand, four hundred seventy-two".