681143500844 has 12 divisors (see below), whose sum is σ = 1192641655968. Its totient is φ = 340388742000.

The previous prime is 681143500823. The next prime is 681143500853. The reversal of 681143500844 is 448005341186.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 681143500795 and 681143500804.

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, 45743732 + ... + 45758619.

It is an arithmetic number, because the mean of its divisors is an integer number (99386804664).

Almost surely, 2^681143500844 is an apocalyptic number.

It is an amenable number.

681143500844 is a deficient number, since it is larger than the sum of its proper divisors (511498155124).

681143500844 is a wasteful number, since it uses less digits than its factorization.

681143500844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91504216 (or 91504214 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 44.

The spelling of 681143500844 in words is "six hundred eighty-one billion, one hundred forty-three million, five hundred thousand, eight hundred forty-four".