681001871787 has 12 divisors (see below), whose sum is σ = 983924720064. Its totient is φ = 453883394160.

The previous prime is 681001871723. The next prime is 681001871831. The reversal of 681001871787 is 787178100186.

It is not a de Polignac number, because 681001871787 - 2⁶ = 681001871723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (681001871087) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9784539 + ... + 9853892.

It is an arithmetic number, because the mean of its divisors is an integer number (81993726672).

Almost surely, 2^681001871787 is an apocalyptic number.

681001871787 is a deficient number, since it is larger than the sum of its proper divisors (302922848277).

681001871787 is a wasteful number, since it uses less digits than its factorization.

681001871787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19642290 (or 19642287 counting only the distinct ones).

The product of its (nonzero) digits is 1053696, while the sum is 54.

The spelling of 681001871787 in words is "six hundred eighty-one billion, one million, eight hundred seventy-one thousand, seven hundred eighty-seven".