507911661 has 16 divisors (see below), whose sum is σ = 754265920. Its totient is φ = 337795920.

The previous prime is 507911659. The next prime is 507911687. The reversal of 507911661 is 166119705.

It is a happy number.

507911661 is a `hidden beast` number, since 507 + 91 + 1 + 6 + 61 = 666.

It is not a de Polignac number, because 507911661 - 2¹ = 507911659 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (507911861) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 10975 + ... + 33708.

It is an arithmetic number, because the mean of its divisors is an integer number (47141620).

Almost surely, 2^507911661 is an apocalyptic number.

It is an amenable number.

507911661 is a deficient number, since it is larger than the sum of its proper divisors (246354259).

507911661 is a wasteful number, since it uses less digits than its factorization.

507911661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45113 (or 45107 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 36.

The square root of 507911661 is about 22536.8955492987. The cubic root of 507911661 is about 797.8649638656.

The spelling of 507911661 in words is "five hundred seven million, nine hundred eleven thousand, six hundred sixty-one".