20516534102531 has 2 divisors, whose sum is σ = 20516534102532. Its totient is φ = 20516534102530.

The previous prime is 20516534102509. The next prime is 20516534102557. The reversal of 20516534102531 is 13520143561502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20516534102531 - 2³⁸ = 20241656195587 is a prime.

It is a super-2 number, since 2×20516534102531² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20516534102231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10258267051265 + 10258267051266.

It is an arithmetic number, because the mean of its divisors is an integer number (10258267051266).

Almost surely, 2^{20516534102531} is an apocalyptic number.

20516534102531 is a deficient number, since it is larger than the sum of its proper divisors (1).

20516534102531 is an equidigital number, since it uses as much as digits as its factorization.

20516534102531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108000, while the sum is 38.

The spelling of 20516534102531 in words is "twenty trillion, five hundred sixteen billion, five hundred thirty-four million, one hundred two thousand, five hundred thirty-one".