20000111994637 has 2 divisors, whose sum is σ = 20000111994638. Its totient is φ = 20000111994636.

The previous prime is 20000111994631. The next prime is 20000111994661. The reversal of 20000111994637 is 73649911100002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19388002918761 + 612109075876 = 4403181^2 + 782374^2 .

It is a cyclic number.

It is not a de Polignac number, because 20000111994637 - 2²³ = 20000103606029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20000111994593 and 20000111994602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20000111994631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000055997318 + 10000055997319.

It is an arithmetic number, because the mean of its divisors is an integer number (10000055997319).

Almost surely, 2^{20000111994637} is an apocalyptic number.

It is an amenable number.

20000111994637 is a deficient number, since it is larger than the sum of its proper divisors (1).

20000111994637 is an equidigital number, since it uses as much as digits as its factorization.

20000111994637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 43.

The spelling of 20000111994637 in words is "twenty trillion, one hundred eleven million, nine hundred ninety-four thousand, six hundred thirty-seven".