20156233265101 has 2 divisors, whose sum is σ = 20156233265102. Its totient is φ = 20156233265100.

The previous prime is 20156233265033. The next prime is 20156233265149. The reversal of 20156233265101 is 10156233265102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20154478911876 + 1754353225 = 4489374^2 + 41885^2 .

It is a cyclic number.

It is not a de Polignac number, because 20156233265101 - 2⁹ = 20156233264589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20156233265501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10078116632550 + 10078116632551.

It is an arithmetic number, because the mean of its divisors is an integer number (10078116632551).

Almost surely, 2^{20156233265101} is an apocalyptic number.

It is an amenable number.

20156233265101 is a deficient number, since it is larger than the sum of its proper divisors (1).

20156233265101 is an equidigital number, since it uses as much as digits as its factorization.

20156233265101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 37.

Subtracting from 20156233265101 its reverse (10156233265102), we obtain a palindrome (9999999999999).

The spelling of 20156233265101 in words is "twenty trillion, one hundred fifty-six billion, two hundred thirty-three million, two hundred sixty-five thousand, one hundred one".