665600555 has 8 divisors (see below), whose sum is σ = 802507344. Its totient is φ = 529956000.

The previous prime is 665600549. The next prime is 665600561. The reversal of 665600555 is 555006566.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (665600549) and next prime (665600561).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 665600555 - 2⁶ = 665600491 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 314396 + ... + 316505.

It is an arithmetic number, because the mean of its divisors is an integer number (100313418).

Almost surely, 2^665600555 is an apocalyptic number.

665600555 is a deficient number, since it is larger than the sum of its proper divisors (136906789).

665600555 is a wasteful number, since it uses less digits than its factorization.

665600555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631117.

The product of its (nonzero) digits is 135000, while the sum is 38.

The square root of 665600555 is about 25799.2355506903. The cubic root of 665600555 is about 873.1145491263.

The spelling of 665600555 in words is "six hundred sixty-five million, six hundred thousand, five hundred fifty-five".