665062551 has 12 divisors (see below), whose sum is σ = 968211712. Its totient is φ = 439883136.

The previous prime is 665062547. The next prime is 665062571. The reversal of 665062551 is 155260566.

It is a happy number.

It is not a de Polignac number, because 665062551 - 2² = 665062547 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665062511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 289786 + ... + 292071.

Almost surely, 2^665062551 is an apocalyptic number.

665062551 is a deficient number, since it is larger than the sum of its proper divisors (303149161).

665062551 is a wasteful number, since it uses less digits than its factorization.

665062551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581990 (or 581987 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The square root of 665062551 is about 25788.8066998068. The cubic root of 665062551 is about 872.8792399576.

The spelling of 665062551 in words is "six hundred sixty-five million, sixty-two thousand, five hundred fifty-one".