16540242565 has 32 divisors (see below), whose sum is σ = 26201574144. Its totient is φ = 9704279040.

The previous prime is 16540242557. The next prime is 16540242583. The reversal of 16540242565 is 56524204561.

It is a happy number.

It is not a de Polignac number, because 16540242565 - 2³ = 16540242557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1257034 + ... + 1270123.

It is an arithmetic number, because the mean of its divisors is an integer number (818799192).

Almost surely, 2^16540242565 is an apocalyptic number.

It is an amenable number.

16540242565 is a deficient number, since it is larger than the sum of its proper divisors (9661331579).

16540242565 is a wasteful number, since it uses less digits than its factorization.

16540242565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2527197.

The product of its (nonzero) digits is 288000, while the sum is 40.

The spelling of 16540242565 in words is "sixteen billion, five hundred forty million, two hundred forty-two thousand, five hundred sixty-five".