665660611225 has 12 divisors (see below), whose sum is σ = 828844141180. Its totient is φ = 530318822400.

The previous prime is 665660611211. The next prime is 665660611283. The reversal of 665660611225 is 522116066566.

It can be written as a sum of positive squares in 6 ways, for example, as 82008922384 + 583651688841 = 286372^2 + 763971^2 .

It is not a de Polignac number, because 665660611225 - 2²³ = 665652222617 is a prime.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55235520 + ... + 55247569.

Almost surely, 2^665660611225 is an apocalyptic number.

It is an amenable number.

665660611225 is a deficient number, since it is larger than the sum of its proper divisors (163183529955).

665660611225 is a wasteful number, since it uses less digits than its factorization.

665660611225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110483340 (or 110483335 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 46.

The spelling of 665660611225 in words is "six hundred sixty-five billion, six hundred sixty million, six hundred eleven thousand, two hundred twenty-five".