20529169691 has 2 divisors, whose sum is σ = 20529169692. Its totient is φ = 20529169690.

The previous prime is 20529169657. The next prime is 20529169699. The reversal of 20529169691 is 19696192502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20529169691 is a prime.

It is not a weakly prime, because it can be changed into another prime (20529169699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10264584845 + 10264584846.

It is an arithmetic number, because the mean of its divisors is an integer number (10264584846).

Almost surely, 2^20529169691 is an apocalyptic number.

20529169691 is a deficient number, since it is larger than the sum of its proper divisors (1).

20529169691 is an equidigital number, since it uses as much as digits as its factorization.

20529169691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 524880, while the sum is 50.

The spelling of 20529169691 in words is "twenty billion, five hundred twenty-nine million, one hundred sixty-nine thousand, six hundred ninety-one".