20755766653 has 4 divisors (see below), whose sum is σ = 20756500128. Its totient is φ = 20755033180.

The previous prime is 20755766641. The next prime is 20755766671. The reversal of 20755766653 is 35666755702.

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 a de Polignac number, because none of the positive numbers 2^k-20755766653 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 20755766653.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20755766623) 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, 322513 + ... + 381478.

It is an arithmetic number, because the mean of its divisors is an integer number (5189125032).

Almost surely, 2^20755766653 is an apocalyptic number.

It is an amenable number.

20755766653 is a deficient number, since it is larger than the sum of its proper divisors (733475).

20755766653 is an equidigital number, since it uses as much as digits as its factorization.

20755766653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 733474.

The product of its (nonzero) digits is 7938000, while the sum is 52.

The spelling of 20755766653 in words is "twenty billion, seven hundred fifty-five million, seven hundred sixty-six thousand, six hundred fifty-three".