665922461472 has 144 divisors (see below), whose sum is σ = 1943581741920. Its totient is φ = 216203682816.

The previous prime is 665922461467. The next prime is 665922461489. The reversal of 665922461472 is 274164229566.

665922461472 is a `hidden beast` number, since 6 + 6 + 5 + 92 + 24 + 61 + 472 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1523463 + ... + 1911225.

It is an arithmetic number, because the mean of its divisors is an integer number (13497095430).

Almost surely, 2^665922461472 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 665922461472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (971790870960).

665922461472 is an abundant number, since it is smaller than the sum of its proper divisors (1277659280448).

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

665922461472 is a wasteful number, since it uses less digits than its factorization.

665922461472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387935 (or 387924 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 54.

The spelling of 665922461472 in words is "six hundred sixty-five billion, nine hundred twenty-two million, four hundred sixty-one thousand, four hundred seventy-two".