20180475389 has 2 divisors, whose sum is σ = 20180475390. Its totient is φ = 20180475388.

The previous prime is 20180475353. The next prime is 20180475391. The reversal of 20180475389 is 98357408102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20180475364 + 25 = 142058^2 + 5^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20180475389 is a prime.

Together with 20180475391, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20180475089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10090237694 + 10090237695.

It is an arithmetic number, because the mean of its divisors is an integer number (10090237695).

Almost surely, 2^20180475389 is an apocalyptic number.

It is an amenable number.

20180475389 is a deficient number, since it is larger than the sum of its proper divisors (1).

20180475389 is an equidigital number, since it uses as much as digits as its factorization.

20180475389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 483840, while the sum is 47.

The spelling of 20180475389 in words is "twenty billion, one hundred eighty million, four hundred seventy-five thousand, three hundred eighty-nine".