681355550518 has 8 divisors (see below), whose sum is σ = 1022064360912. Its totient is φ = 340667430216.

The previous prime is 681355550509. The next prime is 681355550639. The reversal of 681355550518 is 815055553186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5089930 + ... + 5222077.

It is an arithmetic number, because the mean of its divisors is an integer number (127758045114).

Almost surely, 2^681355550518 is an apocalyptic number.

681355550518 is a deficient number, since it is larger than the sum of its proper divisors (340708810394).

681355550518 is a wasteful number, since it uses less digits than its factorization.

681355550518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10345046.

The product of its (nonzero) digits is 3600000, while the sum is 52.

The spelling of 681355550518 in words is "six hundred eighty-one billion, three hundred fifty-five million, five hundred fifty thousand, five hundred eighteen".