665454615225 has 48 divisors (see below), whose sum is σ = 1114771983360. Its totient is φ = 350244993600.

The previous prime is 665454615187. The next prime is 665454615247. The reversal of 665454615225 is 522516454566.

It is not a de Polignac number, because 665454615225 - 2¹⁷ = 665454484153 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1549860 + ... + 1932090.

It is an arithmetic number, because the mean of its divisors is an integer number (23224416320).

Almost surely, 2^665454615225 is an apocalyptic number.

It is an amenable number.

665454615225 is a deficient number, since it is larger than the sum of its proper divisors (449317368135).

665454615225 is a wasteful number, since it uses less digits than its factorization.

665454615225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382550 (or 382545 counting only the distinct ones).

The product of its digits is 8640000, while the sum is 51.

The spelling of 665454615225 in words is "six hundred sixty-five billion, four hundred fifty-four million, six hundred fifteen thousand, two hundred twenty-five".