665407433845 has 32 divisors (see below), whose sum is σ = 995745079296. Its totient is φ = 414705096000.

The previous prime is 665407433833. The next prime is 665407433857. The reversal of 665407433845 is 548334704566.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (665407433833) and next prime (665407433857).

It is not a de Polignac number, because 665407433845 - 2⁵ = 665407433813 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a congruent number.

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, 1517770 + ... + 1906420.

It is an arithmetic number, because the mean of its divisors is an integer number (31117033728).

Almost surely, 2^665407433845 is an apocalyptic number.

It is an amenable number.

665407433845 is a deficient number, since it is larger than the sum of its proper divisors (330337645451).

665407433845 is a wasteful number, since it uses less digits than its factorization.

665407433845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393121.

The product of its (nonzero) digits is 29030400, while the sum is 55.

The spelling of 665407433845 in words is "six hundred sixty-five billion, four hundred seven million, four hundred thirty-three thousand, eight hundred forty-five".