20117701579 has 2 divisors, whose sum is σ = 20117701580. Its totient is φ = 20117701578.

The previous prime is 20117701547. The next prime is 20117701633. The reversal of 20117701579 is 97510771102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20117701579 - 2⁵ = 20117701547 is a prime.

It is not a weakly prime, because it can be changed into another prime (20117701529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10058850789 + 10058850790.

It is an arithmetic number, because the mean of its divisors is an integer number (10058850790).

Almost surely, 2^20117701579 is an apocalyptic number.

20117701579 is a deficient number, since it is larger than the sum of its proper divisors (1).

20117701579 is an equidigital number, since it uses as much as digits as its factorization.

20117701579 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30870, while the sum is 40.

The spelling of 20117701579 in words is "twenty billion, one hundred seventeen million, seven hundred one thousand, five hundred seventy-nine".