16231720539 has 16 divisors (see below), whose sum is σ = 23311164800. Its totient is φ = 10013201856.

The previous prime is 16231720523. The next prime is 16231720553. The reversal of 16231720539 is 93502713261.

It is a happy number.

It is not a de Polignac number, because 16231720539 - 2⁴ = 16231720523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16231720497 and 16231720506.

It is not an unprimeable number, because it can be changed into a prime (16231725539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3308794 + ... + 3313695.

It is an arithmetic number, because the mean of its divisors is an integer number (1456947800).

Almost surely, 2^16231720539 is an apocalyptic number.

16231720539 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

16231720539 is a deficient number, since it is larger than the sum of its proper divisors (7079444261).

16231720539 is a wasteful number, since it uses less digits than its factorization.

16231720539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6622554.

The product of its (nonzero) digits is 68040, while the sum is 39.

The spelling of 16231720539 in words is "sixteen billion, two hundred thirty-one million, seven hundred twenty thousand, five hundred thirty-nine".