665212313454 has 64 divisors (see below), whose sum is σ = 1498131016704. Its totient is φ = 195379278336.

The previous prime is 665212313399. The next prime is 665212313461. The reversal of 665212313454 is 454313212566.

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, 492982 + ... + 1254374.

It is an arithmetic number, because the mean of its divisors is an integer number (23408297136).

Almost surely, 2^665212313454 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665212313454, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (749065508352).

665212313454 is an abundant number, since it is smaller than the sum of its proper divisors (832918703250).

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

665212313454 is a wasteful number, since it uses less digits than its factorization.

665212313454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761921.

The product of its digits is 518400, while the sum is 42.

The spelling of 665212313454 in words is "six hundred sixty-five billion, two hundred twelve million, three hundred thirteen thousand, four hundred fifty-four".