3810636686561 has 4 divisors (see below), whose sum is σ = 3899256144432. Its totient is φ = 3722017228692.

The previous prime is 3810636686557. The next prime is 3810636686627. The reversal of 3810636686561 is 1656866360183.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3810636686561 - 2² = 3810636686557 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3810636686561.

It is not an unprimeable number, because it can be changed into a prime (3810636686161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44309728871 + ... + 44309728956.

It is an arithmetic number, because the mean of its divisors is an integer number (974814036108).

Almost surely, 2^{3810636686561} is an apocalyptic number.

It is an amenable number.

3810636686561 is a deficient number, since it is larger than the sum of its proper divisors (88619457871).

3810636686561 is an equidigital number, since it uses as much as digits as its factorization.

3810636686561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88619457870.

The product of its (nonzero) digits is 22394880, while the sum is 59.

The spelling of 3810636686561 in words is "three trillion, eight hundred ten billion, six hundred thirty-six million, six hundred eighty-six thousand, five hundred sixty-one".