20013065615687 has 2 divisors, whose sum is σ = 20013065615688. Its totient is φ = 20013065615686.

The previous prime is 20013065615681. The next prime is 20013065615729. The reversal of 20013065615687 is 78651656031002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20013065615687 - 2⁴² = 15615019104583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20013065615681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006532807843 + 10006532807844.

It is an arithmetic number, because the mean of its divisors is an integer number (10006532807844).

Almost surely, 2^{20013065615687} is an apocalyptic number.

20013065615687 is a deficient number, since it is larger than the sum of its proper divisors (1).

20013065615687 is an equidigital number, since it uses as much as digits as its factorization.

20013065615687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The spelling of 20013065615687 in words is "twenty trillion, thirteen billion, sixty-five million, six hundred fifteen thousand, six hundred eighty-seven".