20653513630661 has 8 divisors (see below), whose sum is σ = 21552122381760. Its totient is φ = 19754957371072.

The previous prime is 20653513630621. The next prime is 20653513630697. The reversal of 20653513630661 is 16603631535602.

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-20653513630661 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 (20653513630621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12317780 + ... + 13893693.

It is an arithmetic number, because the mean of its divisors is an integer number (2694015297720).

Almost surely, 2^{20653513630661} is an apocalyptic number.

It is an amenable number.

20653513630661 is a deficient number, since it is larger than the sum of its proper divisors (898608751099).

20653513630661 is a wasteful number, since it uses less digits than its factorization.

20653513630661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26245755.

The product of its (nonzero) digits is 1749600, while the sum is 47.

The spelling of 20653513630661 in words is "twenty trillion, six hundred fifty-three billion, five hundred thirteen million, six hundred thirty thousand, six hundred sixty-one".