681780933792 has 144 divisors (see below), whose sum is σ = 2313185454720. Its totient is φ = 194794540416.

The previous prime is 681780933791. The next prime is 681780933793. The reversal of 681780933792 is 297339087186.

681780933792 is a `hidden beast` number, since 6 + 8 + 178 + 0 + 93 + 379 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (681780933791) and next prime (681780933793).

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (681780933791) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8009688 + ... + 8094359.

It is an arithmetic number, because the mean of its divisors is an integer number (16063787880).

Almost surely, 2^681780933792 is an apocalyptic number.

It is an amenable number.

681780933792 is an abundant number, since it is smaller than the sum of its proper divisors (1631404520928).

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

681780933792 is a wasteful number, since it uses less digits than its factorization.

681780933792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16104080 (or 16104059 counting only the distinct ones).

The product of its (nonzero) digits is 27433728, while the sum is 63.

The spelling of 681780933792 in words is "six hundred eighty-one billion, seven hundred eighty million, nine hundred thirty-three thousand, seven hundred ninety-two".