665498977 has 16 divisors (see below), whose sum is σ = 783699840. Its totient is φ = 557136000.

The previous prime is 665498971. The next prime is 665498987. The reversal of 665498977 is 779894566.

It is a cyclic number.

It is not a de Polignac number, because 665498977 - 2¹⁵ = 665466209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665498971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57477 + ... + 68077.

It is an arithmetic number, because the mean of its divisors is an integer number (48981240).

Almost surely, 2^665498977 is an apocalyptic number.

It is an amenable number.

665498977 is a deficient number, since it is larger than the sum of its proper divisors (118200863).

665498977 is a wasteful number, since it uses less digits than its factorization.

665498977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11064.

The product of its digits is 22861440, while the sum is 61.

The square root of 665498977 is about 25797.2668513546. The cubic root of 665498977 is about 873.0701312238.

The spelling of 665498977 in words is "six hundred sixty-five million, four hundred ninety-eight thousand, nine hundred seventy-seven".