20155616443 has 2 divisors, whose sum is σ = 20155616444. Its totient is φ = 20155616442.

The previous prime is 20155616413. The next prime is 20155616447. The reversal of 20155616443 is 34461655102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20155616443 - 2³³ = 11565681851 is a prime.

It is not a weakly prime, because it can be changed into another prime (20155616447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10077808221 + 10077808222.

It is an arithmetic number, because the mean of its divisors is an integer number (10077808222).

Almost surely, 2^20155616443 is an apocalyptic number.

20155616443 is a deficient number, since it is larger than the sum of its proper divisors (1).

20155616443 is an equidigital number, since it uses as much as digits as its factorization.

20155616443 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 20155616443 in words is "twenty billion, one hundred fifty-five million, six hundred sixteen thousand, four hundred forty-three".