20145227657 has 2 divisors, whose sum is σ = 20145227658. Its totient is φ = 20145227656.

The previous prime is 20145227651. The next prime is 20145227723. The reversal of 20145227657 is 75672254102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16368387721 + 3776839936 = 127939^2 + 61456^2 .

It is a cyclic number.

It is not a de Polignac number, because 20145227657 - 2¹² = 20145223561 is a prime.

It is not a weakly prime, because it can be changed into another prime (20145227651) 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, 10072613828 + 10072613829.

It is an arithmetic number, because the mean of its divisors is an integer number (10072613829).

Almost surely, 2^20145227657 is an apocalyptic number.

It is an amenable number.

20145227657 is a deficient number, since it is larger than the sum of its proper divisors (1).

20145227657 is an equidigital number, since it uses as much as digits as its factorization.

20145227657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 235200, while the sum is 41.

The spelling of 20145227657 in words is "twenty billion, one hundred forty-five million, two hundred twenty-seven thousand, six hundred fifty-seven".