515668157 has 4 divisors (see below), whose sum is σ = 546001596. Its totient is φ = 485334720.

The previous prime is 515668141. The next prime is 515668183. The reversal of 515668157 is 751866515.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 213568996 + 302099161 = 14614^2 + 17381^2 .

It is a cyclic number.

It is not a de Polignac number, because 515668157 - 2⁴ = 515668141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (515668117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15166694 + ... + 15166727.

It is an arithmetic number, because the mean of its divisors is an integer number (136500399).

Almost surely, 2^515668157 is an apocalyptic number.

It is an amenable number.

515668157 is a deficient number, since it is larger than the sum of its proper divisors (30333439).

515668157 is a wasteful number, since it uses less digits than its factorization.

515668157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30333438.

The product of its digits is 252000, while the sum is 44.

The square root of 515668157 is about 22708.3279217119. The cubic root of 515668157 is about 801.9059540056.

The spelling of 515668157 in words is "five hundred fifteen million, six hundred sixty-eight thousand, one hundred fifty-seven".