680721155102 has 4 divisors (see below), whose sum is σ = 1021081732656. Its totient is φ = 340360577550.

The previous prime is 680721155089. The next prime is 680721155119. The reversal of 680721155102 is 201551127086.

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

It is a super-2 number, since 2×680721155102² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

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, 170180288774 + ... + 170180288777.

It is an arithmetic number, because the mean of its divisors is an integer number (255270433164).

Almost surely, 2^680721155102 is an apocalyptic number.

680721155102 is a deficient number, since it is larger than the sum of its proper divisors (340360577554).

680721155102 is a wasteful number, since it uses less digits than its factorization.

680721155102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340360577553.

The product of its (nonzero) digits is 33600, while the sum is 38.

The spelling of 680721155102 in words is "six hundred eighty billion, seven hundred twenty-one million, one hundred fifty-five thousand, one hundred two".