681128366560 has 24 divisors (see below), whose sum is σ = 1609165766376. Its totient is φ = 272451346560.

The previous prime is 681128366539. The next prime is 681128366579. The reversal of 681128366560 is 65663821186.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 681128366498 and 681128366507.

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, 2128525986 + ... + 2128526305.

It is an arithmetic number, because the mean of its divisors is an integer number (67048573599).

Almost surely, 2^681128366560 is an apocalyptic number.

It is an amenable number.

681128366560 is an abundant number, since it is smaller than the sum of its proper divisors (928037399816).

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

681128366560 is a wasteful number, since it uses less digits than its factorization.

681128366560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4257052306 (or 4257052298 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 52.

The spelling of 681128366560 in words is "six hundred eighty-one billion, one hundred twenty-eight million, three hundred sixty-six thousand, five hundred sixty".