687553299898 has 4 divisors (see below), whose sum is σ = 1031329949850. Its totient is φ = 343776649948.

The previous prime is 687553299871. The next prime is 687553299907. The reversal of 687553299898 is 898992355786.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 655706399049 + 31846900849 = 809757^2 + 178457^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171888324973 + ... + 171888324976.

Almost surely, 2^687553299898 is an apocalyptic number.

687553299898 is a deficient number, since it is larger than the sum of its proper divisors (343776649952).

687553299898 is a wasteful number, since it uses less digits than its factorization.

687553299898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343776649951.

The product of its digits is 2351462400, while the sum is 79.

The spelling of 687553299898 in words is "six hundred eighty-seven billion, five hundred fifty-three million, two hundred ninety-nine thousand, eight hundred ninety-eight".