515878137087 has 4 divisors (see below), whose sum is σ = 687837516120. Its totient is φ = 343918758056.

The previous prime is 515878137077. The next prime is 515878137113. The reversal of 515878137087 is 780731878515.

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

It is a cyclic number.

It is not a de Polignac number, because 515878137087 - 2⁶ = 515878137023 is a prime.

It is a super-2 number, since 2×515878137087² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 515878137087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (515878137077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85979689512 + ... + 85979689517.

It is an arithmetic number, because the mean of its divisors is an integer number (171959379030).

Almost surely, 2^515878137087 is an apocalyptic number.

515878137087 is a deficient number, since it is larger than the sum of its proper divisors (171959379033).

515878137087 is a wasteful number, since it uses less digits than its factorization.

515878137087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171959379032.

The product of its (nonzero) digits is 13171200, while the sum is 60.

The spelling of 515878137087 in words is "five hundred fifteen billion, eight hundred seventy-eight million, one hundred thirty-seven thousand, eighty-seven".