665172443620 has 24 divisors (see below), whose sum is σ = 1470381192000. Its totient is φ = 252065346912.

The previous prime is 665172443599. The next prime is 665172443623. The reversal of 665172443620 is 26344271566.

It is not an unprimeable number, because it can be changed into a prime (665172443623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 875226520 + ... + 875227279.

It is an arithmetic number, because the mean of its divisors is an integer number (61265883000).

Almost surely, 2^665172443620 is an apocalyptic number.

It is an amenable number.

665172443620 is an abundant number, since it is smaller than the sum of its proper divisors (805208748380).

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

665172443620 is a wasteful number, since it uses less digits than its factorization.

665172443620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1750453827 (or 1750453825 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 46.

The spelling of 665172443620 in words is "six hundred sixty-five billion, one hundred seventy-two million, four hundred forty-three thousand, six hundred twenty".