16540252889 has 4 divisors (see below), whose sum is σ = 16552775220. Its totient is φ = 16527730560.

The previous prime is 16540252823. The next prime is 16540252891. The reversal of 16540252889 is 98825204561.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98825204561 = 173 ⋅571243957.

It can be written as a sum of positive squares in 2 ways, for example, as 15278937664 + 1261315225 = 123608^2 + 35515^2 .

It is a cyclic number.

It is not a de Polignac number, because 16540252889 - 2¹² = 16540248793 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16540252819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6259184 + ... + 6261825.

It is an arithmetic number, because the mean of its divisors is an integer number (4138193805).

Almost surely, 2^16540252889 is an apocalyptic number.

It is an amenable number.

16540252889 is a deficient number, since it is larger than the sum of its proper divisors (12522331).

16540252889 is a wasteful number, since it uses less digits than its factorization.

16540252889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12522330.

The product of its (nonzero) digits is 1382400, while the sum is 50.

The spelling of 16540252889 in words is "sixteen billion, five hundred forty million, two hundred fifty-two thousand, eight hundred eighty-nine".