665434514550 has 48 divisors (see below), whose sum is σ = 1777222031760. Its totient is φ = 163799264640.

The previous prime is 665434514539. The next prime is 665434514599. The reversal of 665434514550 is 55415434566.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 665434514550.

It is a congruent number.

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, 170622285 + ... + 170626184.

It is an arithmetic number, because the mean of its divisors is an integer number (37025458995).

Almost surely, 2^665434514550 is an apocalyptic number.

665434514550 is an abundant number, since it is smaller than the sum of its proper divisors (1111787517210).

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

665434514550 is a wasteful number, since it uses less digits than its factorization.

665434514550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341248497 (or 341248492 counting only the distinct ones).

The product of its (nonzero) digits is 4320000, while the sum is 48.

The spelling of 665434514550 in words is "six hundred sixty-five billion, four hundred thirty-four million, five hundred fourteen thousand, five hundred fifty".