35646809681 has 16 divisors (see below), whose sum is σ = 41569904640. Its totient is φ = 29937295440.

The previous prime is 35646809563. The next prime is 35646809717. The reversal of 35646809681 is 18690864653.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 35646809681 - 2¹⁸ = 35646547537 is a prime.

It is a super-2 number, since 2×35646809681² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (35646803681) 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, 173591 + ... + 318476.

It is an arithmetic number, because the mean of its divisors is an integer number (2598119040).

Almost surely, 2^35646809681 is an apocalyptic number.

It is an amenable number.

35646809681 is a deficient number, since it is larger than the sum of its proper divisors (5923094959).

35646809681 is a wasteful number, since it uses less digits than its factorization.

35646809681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492284.

The product of its (nonzero) digits is 7464960, while the sum is 56.

The spelling of 35646809681 in words is "thirty-five billion, six hundred forty-six million, eight hundred nine thousand, six hundred eighty-one".