20351644661087 has 2 divisors, whose sum is σ = 20351644661088. Its totient is φ = 20351644661086.

The previous prime is 20351644661041. The next prime is 20351644661093. The reversal of 20351644661087 is 78016644615302.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20351644661087 - 2¹⁴ = 20351644644703 is a prime.

It is a super-2 number, since 2×20351644661087² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20351644661587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10175822330543 + 10175822330544.

It is an arithmetic number, because the mean of its divisors is an integer number (10175822330544).

Almost surely, 2^{20351644661087} is an apocalyptic number.

20351644661087 is a deficient number, since it is larger than the sum of its proper divisors (1).

20351644661087 is an equidigital number, since it uses as much as digits as its factorization.

20351644661087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5806080, while the sum is 53.

The spelling of 20351644661087 in words is "twenty trillion, three hundred fifty-one billion, six hundred forty-four million, six hundred sixty-one thousand, eighty-seven".