665412051 has 4 divisors (see below), whose sum is σ = 887216072. Its totient is φ = 443608032.

The previous prime is 665412049. The next prime is 665412061. The reversal of 665412051 is 150214566.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 665412051 - 2¹ = 665412049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665412031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110902006 + ... + 110902011.

It is an arithmetic number, because the mean of its divisors is an integer number (221804018).

Almost surely, 2^665412051 is an apocalyptic number.

665412051 is a deficient number, since it is larger than the sum of its proper divisors (221804021).

665412051 is a wasteful number, since it uses less digits than its factorization.

665412051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221804020.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 665412051 is about 25795.5820054520. The cubic root of 665412051 is about 873.0321167407.

The spelling of 665412051 in words is "six hundred sixty-five million, four hundred twelve thousand, fifty-one".