3699998636561 has 8 divisors (see below), whose sum is σ = 3709265397504. Its totient is φ = 3690738913680.

The previous prime is 3699998636539. The next prime is 3699998636569. The reversal of 3699998636561 is 1656368999963.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3699998636561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3699998636569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 705986 + ... + 2810411.

It is an arithmetic number, because the mean of its divisors is an integer number (463658174688).

Almost surely, 2^{3699998636561} is an apocalyptic number.

It is an amenable number.

3699998636561 is a deficient number, since it is larger than the sum of its proper divisors (9266760943).

3699998636561 is a wasteful number, since it uses less digits than its factorization.

3699998636561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3519031.

The product of its digits is 3061100160, while the sum is 80.

The spelling of 3699998636561 in words is "three trillion, six hundred ninety-nine billion, nine hundred ninety-eight million, six hundred thirty-six thousand, five hundred sixty-one".