20679100557881 has 2 divisors, whose sum is σ = 20679100557882. Its totient is φ = 20679100557880.

The previous prime is 20679100557853. The next prime is 20679100557889. The reversal of 20679100557881 is 18875500197602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20212748147881 + 466352410000 = 4495859^2 + 682900^2 .

It is a cyclic number.

It is not a de Polignac number, because 20679100557881 - 2³⁴ = 20661920688697 is a prime.

It is a super-2 number, since 2×20679100557881² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20679100557881.

It is not a weakly prime, because it can be changed into another prime (20679100557889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10339550278940 + 10339550278941.

It is an arithmetic number, because the mean of its divisors is an integer number (10339550278941).

Almost surely, 2^{20679100557881} is an apocalyptic number.

It is an amenable number.

20679100557881 is a deficient number, since it is larger than the sum of its proper divisors (1).

20679100557881 is an equidigital number, since it uses as much as digits as its factorization.

20679100557881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8467200, while the sum is 59.

The spelling of 20679100557881 in words is "twenty trillion, six hundred seventy-nine billion, one hundred million, five hundred fifty-seven thousand, eight hundred eighty-one".