681291065766 has 32 divisors (see below), whose sum is σ = 1434364306560. Its totient is φ = 215134448256.

The previous prime is 681291065729. The next prime is 681291065779. The reversal of 681291065766 is 667560192186.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2519230 + ... + 2776526.

It is an arithmetic number, because the mean of its divisors is an integer number (44823884580).

Almost surely, 2^681291065766 is an apocalyptic number.

681291065766 is an abundant number, since it is smaller than the sum of its proper divisors (753073240794).

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

681291065766 is a wasteful number, since it uses less digits than its factorization.

681291065766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280548.

The product of its (nonzero) digits is 6531840, while the sum is 57.

The spelling of 681291065766 in words is "six hundred eighty-one billion, two hundred ninety-one million, sixty-five thousand, seven hundred sixty-six".