20117760457 has 2 divisors, whose sum is σ = 20117760458. Its totient is φ = 20117760456.

The previous prime is 20117760437. The next prime is 20117760463. The reversal of 20117760457 is 75406771102.

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., 10967116176 + 9150644281 = 104724^2 + 95659^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20117760457 is a prime.

It is not a weakly prime, because it can be changed into another prime (20117760437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10058880228 + 10058880229.

It is an arithmetic number, because the mean of its divisors is an integer number (10058880229).

Almost surely, 2^20117760457 is an apocalyptic number.

It is an amenable number.

20117760457 is a deficient number, since it is larger than the sum of its proper divisors (1).

20117760457 is an equidigital number, since it uses as much as digits as its factorization.

20117760457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82320, while the sum is 40.

The spelling of 20117760457 in words is "twenty billion, one hundred seventeen million, seven hundred sixty thousand, four hundred fifty-seven".