16540163231 has 2 divisors, whose sum is σ = 16540163232. Its totient is φ = 16540163230.

The previous prime is 16540163197. The next prime is 16540163239. The reversal of 16540163231 is 13236104561.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16540163231 is a prime.

It is a super-2 number, since 2×16540163231² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16540163239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8270081615 + 8270081616.

It is an arithmetic number, because the mean of its divisors is an integer number (8270081616).

Almost surely, 2^16540163231 is an apocalyptic number.

16540163231 is a deficient number, since it is larger than the sum of its proper divisors (1).

16540163231 is an equidigital number, since it uses as much as digits as its factorization.

16540163231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 32.

Adding to 16540163231 its reverse (13236104561), we get a palindrome (29776267792).

The spelling of 16540163231 in words is "sixteen billion, five hundred forty million, one hundred sixty-three thousand, two hundred thirty-one".