20116561122157 has 4 divisors (see below), whose sum is σ = 20116656115200. Its totient is φ = 20116466129116.

The previous prime is 20116561122103. The next prime is 20116561122199. The reversal of 20116561122157 is 75122116561102.

It is a happy number.

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 20116561122157 - 2⁷ = 20116561122029 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 (20116561122557) 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 3 ways as a sum of consecutive naturals, for example, 47178157 + ... + 47602642.

It is an arithmetic number, because the mean of its divisors is an integer number (5029164028800).

Almost surely, 2^{20116561122157} is an apocalyptic number.

It is an amenable number.

20116561122157 is a deficient number, since it is larger than the sum of its proper divisors (94993043).

20116561122157 is an equidigital number, since it uses as much as digits as its factorization.

20116561122157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94993042.

The product of its (nonzero) digits is 50400, while the sum is 40.

Adding to 20116561122157 its reverse (75122116561102), we get a palindrome (95238677683259).

The spelling of 20116561122157 in words is "twenty trillion, one hundred sixteen billion, five hundred sixty-one million, one hundred twenty-two thousand, one hundred fifty-seven".