653663205661 has 4 divisors (see below), whose sum is σ = 653847912000. Its totient is φ = 653478499324.

The previous prime is 653663205659. The next prime is 653663205703. The reversal of 653663205661 is 166502366356.

653663205661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 653663205661 - 2¹ = 653663205659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (653663205061) 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, 92347861 + ... + 92354938.

It is an arithmetic number, because the mean of its divisors is an integer number (163461978000).

Almost surely, 2^653663205661 is an apocalyptic number.

It is an amenable number.

653663205661 is a deficient number, since it is larger than the sum of its proper divisors (184706339).

653663205661 is a wasteful number, since it uses less digits than its factorization.

653663205661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184706338.

The product of its (nonzero) digits is 3499200, while the sum is 49.

The spelling of 653663205661 in words is "six hundred fifty-three billion, six hundred sixty-three million, two hundred five thousand, six hundred sixty-one".