681244752651 has 16 divisors (see below), whose sum is σ = 917358942240. Its totient is φ = 449647251200.

The previous prime is 681244752649. The next prime is 681244752719. The reversal of 681244752651 is 156257442186.

It is a cyclic number.

It is not a de Polignac number, because 681244752651 - 2¹ = 681244752649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 681244752594 and 681244752603.

It is not an unprimeable number, because it can be changed into a prime (681244752451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12052111 + ... + 12108503.

It is an arithmetic number, because the mean of its divisors is an integer number (57334933890).

Almost surely, 2^681244752651 is an apocalyptic number.

681244752651 is a deficient number, since it is larger than the sum of its proper divisors (236114189589).

681244752651 is a wasteful number, since it uses less digits than its factorization.

681244752651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96366.

The product of its digits is 3225600, while the sum is 51.

The spelling of 681244752651 in words is "six hundred eighty-one billion, two hundred forty-four million, seven hundred fifty-two thousand, six hundred fifty-one".