665250665 has 16 divisors (see below), whose sum is σ = 813274560. Its totient is φ = 522250560.

The previous prime is 665250661. The next prime is 665250683. The reversal of 665250665 is 566052566.

It is not a de Polignac number, because 665250665 - 2² = 665250661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665250661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198050 + ... + 201380.

It is an arithmetic number, because the mean of its divisors is an integer number (50829660).

Almost surely, 2^665250665 is an apocalyptic number.

It is an amenable number.

665250665 is a deficient number, since it is larger than the sum of its proper divisors (148023895).

665250665 is a wasteful number, since it uses less digits than its factorization.

665250665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4072.

The product of its (nonzero) digits is 324000, while the sum is 41.

The square root of 665250665 is about 25792.4536444286. The cubic root of 665250665 is about 872.9615306264.

The spelling of 665250665 in words is "six hundred sixty-five million, two hundred fifty thousand, six hundred sixty-five".