687561055198 has 16 divisors (see below), whose sum is σ = 1032054736176. Its totient is φ = 343542888640.

The previous prime is 687561055193. The next prime is 687561055199. The reversal of 687561055198 is 891550165786.

687561055198 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687561055193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21197613 + ... + 21230023.

It is an arithmetic number, because the mean of its divisors is an integer number (64503421011).

Almost surely, 2^687561055198 is an apocalyptic number.

687561055198 is a deficient number, since it is larger than the sum of its proper divisors (344493680978).

687561055198 is a wasteful number, since it uses less digits than its factorization.

687561055198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39419.

The product of its (nonzero) digits is 18144000, while the sum is 61.

The spelling of 687561055198 in words is "six hundred eighty-seven billion, five hundred sixty-one million, fifty-five thousand, one hundred ninety-eight".