20156365630369 has 2 divisors, whose sum is σ = 20156365630370. Its totient is φ = 20156365630368.

The previous prime is 20156365630333. The next prime is 20156365630547. The reversal of 20156365630369 is 96303656365102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14413321134144 + 5743044496225 = 3796488^2 + 2396465^2 .

It is a cyclic number.

It is not a de Polignac number, because 20156365630369 - 2¹³ = 20156365622177 is a prime.

It is a super-2 number, since 2×20156365630369² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20156365639369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10078182815184 + 10078182815185.

It is an arithmetic number, because the mean of its divisors is an integer number (10078182815185).

Almost surely, 2^{20156365630369} is an apocalyptic number.

It is an amenable number.

20156365630369 is a deficient number, since it is larger than the sum of its proper divisors (1).

20156365630369 is an equidigital number, since it uses as much as digits as its factorization.

20156365630369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15746400, while the sum is 55.

It can be divided in two parts, 2015636 and 5630369, that added together give a triangular number (7646005 = T₃₉₁₀).

The spelling of 20156365630369 in words is "twenty trillion, one hundred fifty-six billion, three hundred sixty-five million, six hundred thirty thousand, three hundred sixty-nine".