20680008061 has 2 divisors, whose sum is σ = 20680008062. Its totient is φ = 20680008060.

The previous prime is 20680008059. The next prime is 20680008091. The reversal of 20680008061 is 16080008602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10698799225 + 9981208836 = 103435^2 + 99906^2 .

It is a cyclic number.

It is not a de Polignac number, because 20680008061 - 2¹ = 20680008059 is a prime.

Together with 20680008059, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20680008001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10340004030 + 10340004031.

It is an arithmetic number, because the mean of its divisors is an integer number (10340004031).

Almost surely, 2^20680008061 is an apocalyptic number.

It is an amenable number.

20680008061 is a deficient number, since it is larger than the sum of its proper divisors (1).

20680008061 is an equidigital number, since it uses as much as digits as its factorization.

20680008061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 31.

The spelling of 20680008061 in words is "twenty billion, six hundred eighty million, eight thousand, sixty-one".