687613996973 has 4 divisors (see below), whose sum is σ = 723804207360. Its totient is φ = 651423786588.

The previous prime is 687613996963. The next prime is 687613997051. The reversal of 687613996973 is 379699316786.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 687613996973 - 2¹⁰ = 687613995949 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 687613996973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687613996963) 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, 18095105165 + ... + 18095105202.

It is an arithmetic number, because the mean of its divisors is an integer number (180951051840).

Almost surely, 2^687613996973 is an apocalyptic number.

It is an amenable number.

687613996973 is a deficient number, since it is larger than the sum of its proper divisors (36190210387).

687613996973 is a wasteful number, since it uses less digits than its factorization.

687613996973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36190210386.

The product of its digits is 555532992, while the sum is 74.

The spelling of 687613996973 in words is "six hundred eighty-seven billion, six hundred thirteen million, nine hundred ninety-six thousand, nine hundred seventy-three".