16500145993 has 2 divisors, whose sum is σ = 16500145994. Its totient is φ = 16500145992.

The previous prime is 16500145933. The next prime is 16500145997. The reversal of 16500145993 is 39954100561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15188837049 + 1311308944 = 123243^2 + 36212^2 .

It is a cyclic number.

It is not a de Polignac number, because 16500145993 - 2²¹ = 16498048841 is a prime.

It is not a weakly prime, because it can be changed into another prime (16500145997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8250072996 + 8250072997.

It is an arithmetic number, because the mean of its divisors is an integer number (8250072997).

Almost surely, 2^16500145993 is an apocalyptic number.

It is an amenable number.

16500145993 is a deficient number, since it is larger than the sum of its proper divisors (1).

16500145993 is an equidigital number, since it uses as much as digits as its factorization.

16500145993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145800, while the sum is 43.

The spelling of 16500145993 in words is "sixteen billion, five hundred million, one hundred forty-five thousand, nine hundred ninety-three".