665116555 has 16 divisors (see below), whose sum is σ = 819169344. Its totient is φ = 518123520.

The previous prime is 665116547. The next prime is 665116567. The reversal of 665116555 is 555611566.

It is not a de Polignac number, because 665116555 - 2³ = 665116547 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115474 + ... + 121096.

It is an arithmetic number, because the mean of its divisors is an integer number (51198084).

Almost surely, 2^665116555 is an apocalyptic number.

665116555 is a deficient number, since it is larger than the sum of its proper divisors (154052789).

665116555 is a wasteful number, since it uses less digits than its factorization.

665116555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6246.

The product of its digits is 135000, while the sum is 40.

The square root of 665116555 is about 25789.8537219582. The cubic root of 665116555 is about 872.9028656524.

The spelling of 665116555 in words is "six hundred sixty-five million, one hundred sixteen thousand, five hundred fifty-five".