665615007 has 12 divisors (see below), whose sum is σ = 970430760. Its totient is φ = 439595568.

The previous prime is 665615003. The next prime is 665615023. The reversal of 665615007 is 700516566.

It is a happy number.

It is not a de Polignac number, because 665615007 - 2² = 665615003 is a prime.

It is a super-2 number, since 2×665615007² = 886086675087220098, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665615003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 344632 + ... + 346557.

It is an arithmetic number, because the mean of its divisors is an integer number (80869230).

Almost surely, 2^665615007 is an apocalyptic number.

665615007 is a deficient number, since it is larger than the sum of its proper divisors (304815753).

665615007 is a wasteful number, since it uses less digits than its factorization.

665615007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691302 (or 691299 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 665615007 is about 25799.5156349882. The cubic root of 665615007 is about 873.1208683118.

The spelling of 665615007 in words is "six hundred sixty-five million, six hundred fifteen thousand, seven".