665669151 has 32 divisors (see below), whose sum is σ = 1176069120. Its totient is φ = 363841632.

The previous prime is 665669141. The next prime is 665669171. The reversal of 665669151 is 151966566.

It is not a de Polignac number, because 665669151 - 2⁶ = 665669087 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 665669097 and 665669106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665669141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72220 + ... + 80913.

It is an arithmetic number, because the mean of its divisors is an integer number (36752160).

Almost surely, 2^665669151 is an apocalyptic number.

665669151 is a deficient number, since it is larger than the sum of its proper divisors (510399969).

665669151 is a wasteful number, since it uses less digits than its factorization.

665669151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153172 (or 153166 counting only the distinct ones).

The product of its digits is 291600, while the sum is 45.

The square root of 665669151 is about 25800.5649356753. The cubic root of 665669151 is about 873.1445421443.

The spelling of 665669151 in words is "six hundred sixty-five million, six hundred sixty-nine thousand, one hundred fifty-one".