680818998635388 has 36 divisors (see below), whose sum is σ = 1720983994213120. Its totient is φ = 226936388131776.

The previous prime is 680818998635383. The next prime is 680818998635401. The reversal of 680818998635388 is 883536899818086.

680818998635388 is a `hidden beast` number, since 6 + 8 + 0 + 8 + 1 + 8 + 9 + 9 + 8 + 63 + 538 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 680818998635298 and 680818998635307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680818998635383) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 134059153 + ... + 139044936.

Almost surely, 2^{680818998635388} is an apocalyptic number.

It is an amenable number.

680818998635388 is an abundant number, since it is smaller than the sum of its proper divisors (1040164995577732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

680818998635388 is a wasteful number, since it uses less digits than its factorization.

680818998635388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273173346 (or 273173341 counting only the distinct ones).

The product of its (nonzero) digits is 34398535680, while the sum is 90.

The spelling of 680818998635388 in words is "six hundred eighty trillion, eight hundred eighteen billion, nine hundred ninety-eight million, six hundred thirty-five thousand, three hundred eighty-eight".