20156143289 has 2 divisors, whose sum is σ = 20156143290. Its totient is φ = 20156143288.

The previous prime is 20156143229. The next prime is 20156143303. The reversal of 20156143289 is 98234165102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16004274064 + 4151869225 = 126508^2 + 64435^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20156143289 is a prime.

It is a super-2 number, since 2×20156143289² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20156143229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10078071644 + 10078071645.

It is an arithmetic number, because the mean of its divisors is an integer number (10078071645).

Almost surely, 2^20156143289 is an apocalyptic number.

It is an amenable number.

20156143289 is a deficient number, since it is larger than the sum of its proper divisors (1).

20156143289 is an equidigital number, since it uses as much as digits as its factorization.

20156143289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 20156143289 in words is "twenty billion, one hundred fifty-six million, one hundred forty-three thousand, two hundred eighty-nine".