16562121399 has 12 divisors (see below), whose sum is σ = 23978319456. Its totient is φ = 11015911872.

The previous prime is 16562121379. The next prime is 16562121403. The reversal of 16562121399 is 99312126561.

16562121399 is a `hidden beast` number, since 1 + 6 + 5 + 621 + 2 + 13 + 9 + 9 = 666.

It is not a de Polignac number, because 16562121399 - 2⁷ = 16562121271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16562121319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2121087 + ... + 2128880.

It is an arithmetic number, because the mean of its divisors is an integer number (1998193288).

Almost surely, 2^16562121399 is an apocalyptic number.

16562121399 is a deficient number, since it is larger than the sum of its proper divisors (7416198057).

16562121399 is a wasteful number, since it uses less digits than its factorization.

16562121399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4250406 (or 4250403 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The spelling of 16562121399 in words is "sixteen billion, five hundred sixty-two million, one hundred twenty-one thousand, three hundred ninety-nine".