20145779233 has 2 divisors, whose sum is σ = 20145779234. Its totient is φ = 20145779232.

The previous prime is 20145779231. The next prime is 20145779309. The reversal of 20145779233 is 33297754102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19997353744 + 148425489 = 141412^2 + 12183^2 .

It is a cyclic number.

It is not a de Polignac number, because 20145779233 - 2¹ = 20145779231 is a prime.

Together with 20145779231, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20145779233.

It is not a weakly prime, because it can be changed into another prime (20145779231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10072889616 + 10072889617.

It is an arithmetic number, because the mean of its divisors is an integer number (10072889617).

Almost surely, 2^20145779233 is an apocalyptic number.

It is an amenable number.

20145779233 is a deficient number, since it is larger than the sum of its proper divisors (1).

20145779233 is an equidigital number, since it uses as much as digits as its factorization.

20145779233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 43.

The spelling of 20145779233 in words is "twenty billion, one hundred forty-five million, seven hundred seventy-nine thousand, two hundred thirty-three".