687488657157 has 6 divisors (see below), whose sum is σ = 993039171462. Its totient is φ = 458325771432.

The previous prime is 687488657003. The next prime is 687488657161. The reversal of 687488657157 is 751756884786.

It is a happy number.

687488657157 is a `hidden beast` number, since 6 + 8 + 7 + 48 + 8 + 6 + 571 + 5 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 466105232961 + 221383424196 = 682719^2 + 470514^2 .

It is not a de Polignac number, because 687488657157 - 2¹⁰ = 687488656133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687488657657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38193814278 + ... + 38193814295.

It is an arithmetic number, because the mean of its divisors is an integer number (165506528577).

Almost surely, 2^687488657157 is an apocalyptic number.

It is an amenable number.

687488657157 is a deficient number, since it is larger than the sum of its proper divisors (305550514305).

687488657157 is a wasteful number, since it uses less digits than its factorization.

687488657157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76387628579 (or 76387628576 counting only the distinct ones).

The product of its digits is 632217600, while the sum is 72.

The spelling of 687488657157 in words is "six hundred eighty-seven billion, four hundred eighty-eight million, six hundred fifty-seven thousand, one hundred fifty-seven".