787986685517 has 24 divisors (see below), whose sum is σ = 824234803200. Its totient is φ = 752389803648.

The previous prime is 787986685511. The next prime is 787986685597. The reversal of 787986685517 is 715586689787.

It is not a de Polignac number, because 787986685517 - 2⁴ = 787986685501 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 (787986685511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 616095284 + ... + 616096562.

It is an arithmetic number, because the mean of its divisors is an integer number (34343116800).

Almost surely, 2^787986685517 is an apocalyptic number.

It is an amenable number.

787986685517 is a deficient number, since it is larger than the sum of its proper divisors (36248117683).

787986685517 is a wasteful number, since it uses less digits than its factorization.

787986685517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2253 (or 1844 counting only the distinct ones).

The product of its digits is 1422489600, while the sum is 77.

The spelling of 787986685517 in words is "seven hundred eighty-seven billion, nine hundred eighty-six million, six hundred eighty-five thousand, five hundred seventeen".