20351644661111 has 2 divisors, whose sum is σ = 20351644661112. Its totient is φ = 20351644661110.

The previous prime is 20351644661093. The next prime is 20351644661143. The reversal of 20351644661111 is 11116644615302.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20351644661111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20351644661311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10175822330555 + 10175822330556.

It is an arithmetic number, because the mean of its divisors is an integer number (10175822330556).

Almost surely, 2^{20351644661111} is an apocalyptic number.

20351644661111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20351644661111 is an equidigital number, since it uses as much as digits as its factorization.

20351644661111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 20351644661111 in words is "twenty trillion, three hundred fifty-one billion, six hundred forty-four million, six hundred sixty-one thousand, one hundred eleven".