506156661 has 16 divisors (see below), whose sum is σ = 750638400. Its totient is φ = 337088304.

The previous prime is 506156647. The next prime is 506156663. The reversal of 506156661 is 166651605.

It is not a de Polignac number, because 506156661 - 2⁶ = 506156597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (506156663) 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, 18315 + ... + 36711.

It is an arithmetic number, because the mean of its divisors is an integer number (46914900).

Almost surely, 2^506156661 is an apocalyptic number.

It is an amenable number.

506156661 is a deficient number, since it is larger than the sum of its proper divisors (244481739).

506156661 is a wasteful number, since it uses less digits than its factorization.

506156661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19425 (or 19419 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 506156661 is about 22497.9257043844. The cubic root of 506156661 is about 796.9449424007.

The spelling of 506156661 in words is "five hundred six million, one hundred fifty-six thousand, six hundred sixty-one".