16242737809 has 3 divisors (see below), whose sum is σ = 16242865257. Its totient is φ = 16242610362.

The previous prime is 16242737807. The next prime is 16242737867. The reversal of 16242737809 is 90873724261.

It is a happy number.

The square root of 16242737809 is 127447.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 16242737809 - 2¹ = 16242737807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16242737807) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 63724 + ... + 191170.

It is an arithmetic number, because the mean of its divisors is an integer number (5414288419).

Almost surely, 2^16242737809 is an apocalyptic number.

16242737809 is the 127447-th square number.

16242737809 is the 63724-th centered octagonal number.

It is an amenable number.

16242737809 is a deficient number, since it is larger than the sum of its proper divisors (127448).

16242737809 is an frugal number, since it uses more digits than its factorization.

16242737809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254894 (or 127447 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 49.

Multiplying 16242737809 by its sum of digits (49), we get a square (795894152641 = 892129²).

The spelling of 16242737809 in words is "sixteen billion, two hundred forty-two million, seven hundred thirty-seven thousand, eight hundred nine".