687745591071 has 64 divisors (see below), whose sum is σ = 1166168088576. Its totient is φ = 350128771200.

The previous prime is 687745591063. The next prime is 687745591073. The reversal of 687745591071 is 170195547786.

It is not a de Polignac number, because 687745591071 - 2³ = 687745591063 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 687745590996 and 687745591014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687745591073) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10827876 + ... + 10891206.

It is an arithmetic number, because the mean of its divisors is an integer number (18221376384).

Almost surely, 2^687745591071 is an apocalyptic number.

687745591071 is a deficient number, since it is larger than the sum of its proper divisors (478422497505).

687745591071 is a wasteful number, since it uses less digits than its factorization.

687745591071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64292.

The product of its (nonzero) digits is 14817600, while the sum is 60.

The spelling of 687745591071 in words is "six hundred eighty-seven billion, seven hundred forty-five million, five hundred ninety-one thousand, seventy-one".