665156516 has 12 divisors (see below), whose sum is σ = 1165098480. Its totient is φ = 332271240.

The previous prime is 665156497. The next prime is 665156563. The reversal of 665156516 is 615651566.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71846 + ... + 80573.

It is an arithmetic number, because the mean of its divisors is an integer number (97091540).

Almost surely, 2^665156516 is an apocalyptic number.

It is an amenable number.

665156516 is a deficient number, since it is larger than the sum of its proper divisors (499941964).

665156516 is a wasteful number, since it uses less digits than its factorization.

665156516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153514 (or 153512 counting only the distinct ones).

The product of its digits is 162000, while the sum is 41.

The square root of 665156516 is about 25790.6284529866. The cubic root of 665156516 is about 872.9203469859.

The spelling of 665156516 in words is "six hundred sixty-five million, one hundred fifty-six thousand, five hundred sixteen".