16309726813 has 4 divisors (see below), whose sum is σ = 16310763868. Its totient is φ = 16308689760.

The previous prime is 16309726793. The next prime is 16309726843. The reversal of 16309726813 is 31862790361.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4152900249 + 12156826564 = 64443^2 + 110258^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16309726813 is a prime.

It is a super-2 number, since 2×16309726813² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16309726843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 494568 + ... + 526513.

It is an arithmetic number, because the mean of its divisors is an integer number (4077690967).

Almost surely, 2^16309726813 is an apocalyptic number.

It is an amenable number.

16309726813 is a deficient number, since it is larger than the sum of its proper divisors (1037055).

16309726813 is a wasteful number, since it uses less digits than its factorization.

16309726813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037054.

The product of its (nonzero) digits is 326592, while the sum is 46.

The spelling of 16309726813 in words is "sixteen billion, three hundred nine million, seven hundred twenty-six thousand, eight hundred thirteen".