665655051 has 8 divisors (see below), whose sum is σ = 902583360. Its totient is φ = 436248392.

The previous prime is 665655047. The next prime is 665655073. The reversal of 665655051 is 150556566.

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

It is a cyclic number.

It is not a de Polignac number, because 665655051 - 2² = 665655047 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665659051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1880205 + ... + 1880558.

It is an arithmetic number, because the mean of its divisors is an integer number (112822920).

Almost surely, 2^665655051 is an apocalyptic number.

665655051 is a deficient number, since it is larger than the sum of its proper divisors (236928309).

665655051 is a wasteful number, since it uses less digits than its factorization.

665655051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3760825.

The product of its (nonzero) digits is 135000, while the sum is 39.

The square root of 665655051 is about 25800.2916843977. The cubic root of 665655051 is about 873.1383772074.

The spelling of 665655051 in words is "six hundred sixty-five million, six hundred fifty-five thousand, fifty-one".