20599078961 has 2 divisors, whose sum is σ = 20599078962. Its totient is φ = 20599078960.

The previous prime is 20599078949. The next prime is 20599078963. The reversal of 20599078961 is 16987099502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17145283600 + 3453795361 = 130940^2 + 58769^2 .

It is a cyclic number.

It is not a de Polignac number, because 20599078961 - 2¹⁰ = 20599077937 is a prime.

Together with 20599078963, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20599078897 and 20599078906.

It is not a weakly prime, because it can be changed into another prime (20599078963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10299539480 + 10299539481.

It is an arithmetic number, because the mean of its divisors is an integer number (10299539481).

Almost surely, 2^20599078961 is an apocalyptic number.

It is an amenable number.

20599078961 is a deficient number, since it is larger than the sum of its proper divisors (1).

20599078961 is an equidigital number, since it uses as much as digits as its factorization.

20599078961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2449440, while the sum is 56.

The spelling of 20599078961 in words is "twenty billion, five hundred ninety-nine million, seventy-eight thousand, nine hundred sixty-one".