681675651 has 6 divisors (see below), whose sum is σ = 984642620. Its totient is φ = 454450428.

The previous prime is 681675649. The next prime is 681675703. The reversal of 681675651 is 156576186.

681675651 is a `hidden beast` number, since 6 + 81 + 6 + 7 + 565 + 1 = 666.

It is not a de Polignac number, because 681675651 - 2¹ = 681675649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 681675597 and 681675606.

It is not an unprimeable number, because it can be changed into a prime (681675611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37870861 + ... + 37870878.

Almost surely, 2^681675651 is an apocalyptic number.

681675651 is a deficient number, since it is larger than the sum of its proper divisors (302966969).

681675651 is a wasteful number, since it uses less digits than its factorization.

681675651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75741745 (or 75741742 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The square root of 681675651 is about 26108.9189933249. The cubic root of 681675651 is about 880.0876509629.

The spelling of 681675651 in words is "six hundred eighty-one million, six hundred seventy-five thousand, six hundred fifty-one".