681780117 has 16 divisors (see below), whose sum is σ = 948050432. Its totient is φ = 435317760.

The previous prime is 681780107. The next prime is 681780119. The reversal of 681780117 is 711087186.

It is not a de Polignac number, because 681780117 - 2¹⁰ = 681779093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681780119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28768 + ... + 46809.

It is an arithmetic number, because the mean of its divisors is an integer number (59253152).

Almost surely, 2^681780117 is an apocalyptic number.

It is an amenable number.

681780117 is a deficient number, since it is larger than the sum of its proper divisors (266270315).

681780117 is a wasteful number, since it uses less digits than its factorization.

681780117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75708.

The product of its (nonzero) digits is 18816, while the sum is 39.

The square root of 681780117 is about 26110.9194974057. The cubic root of 681780117 is about 880.1326061359.

The spelling of 681780117 in words is "six hundred eighty-one million, seven hundred eighty thousand, one hundred seventeen".