3651763681 has 4 divisors (see below), whose sum is σ = 3652320532. Its totient is φ = 3651206832.

The previous prime is 3651763667. The next prime is 3651763711. The reversal of 3651763681 is 1863671563.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15673681 + 3636090000 = 3959^2 + 60300^2 .

It is a cyclic number.

It is not a de Polignac number, because 3651763681 - 2⁵ = 3651763649 is a prime.

It is a super-2 number, since 2×3651763681² = 26670755963741339522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3651764681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268470 + ... + 281743.

It is an arithmetic number, because the mean of its divisors is an integer number (913080133).

Almost surely, 2^3651763681 is an apocalyptic number.

It is an amenable number.

3651763681 is a deficient number, since it is larger than the sum of its proper divisors (556851).

3651763681 is an equidigital number, since it uses as much as digits as its factorization.

3651763681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556850.

The product of its digits is 544320, while the sum is 46.

The square root of 3651763681 is about 60429.8244329735. The cubic root of 3651763681 is about 1539.9296759083.

The spelling of 3651763681 in words is "three billion, six hundred fifty-one million, seven hundred sixty-three thousand, six hundred eighty-one".