665516031 has 8 divisors (see below), whose sum is σ = 907991040. Its totient is φ = 433359192.

The previous prime is 665516023. The next prime is 665516113. The reversal of 665516031 is 130615566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 665516031 - 2³ = 665516023 is a prime.

It is a super-2 number, since 2×665516031² = 885823175035985922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 665515983 and 665516001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665516011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2579391 + ... + 2579648.

It is an arithmetic number, because the mean of its divisors is an integer number (113498880).

Almost surely, 2^665516031 is an apocalyptic number.

665516031 is a deficient number, since it is larger than the sum of its proper divisors (242475009).

665516031 is a wasteful number, since it uses less digits than its factorization.

665516031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5159085.

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 665516031 is about 25797.5973881290. The cubic root of 665516031 is about 873.0775888916.

The spelling of 665516031 in words is "six hundred sixty-five million, five hundred sixteen thousand, thirty-one".