20752133521661 has 4 divisors (see below), whose sum is σ = 20752162729152. Its totient is φ = 20752104314172.

The previous prime is 20752133521657. The next prime is 20752133521667. The reversal of 20752133521661 is 16612533125702.

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 20752133521661 - 2² = 20752133521657 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 (20752133521667) 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, 13510715 + ... + 14968088.

It is an arithmetic number, because the mean of its divisors is an integer number (5188040682288).

Almost surely, 2^{20752133521661} is an apocalyptic number.

It is an amenable number.

20752133521661 is a deficient number, since it is larger than the sum of its proper divisors (29207491).

20752133521661 is an equidigital number, since it uses as much as digits as its factorization.

20752133521661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29207490.

The product of its (nonzero) digits is 453600, while the sum is 44.

The spelling of 20752133521661 in words is "twenty trillion, seven hundred fifty-two billion, one hundred thirty-three million, five hundred twenty-one thousand, six hundred sixty-one".