16506143231 has 4 divisors (see below), whose sum is σ = 16543403592. Its totient is φ = 16468882872.

The previous prime is 16506143221. The next prime is 16506143267. The reversal of 16506143231 is 13234160561.

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

It is a cyclic number.

It is not a de Polignac number, because 16506143231 - 2⁶ = 16506143167 is a prime.

It is a super-2 number, since 2×16506143231² (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 (16506143221) 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, 18629516 + ... + 18630401.

It is an arithmetic number, because the mean of its divisors is an integer number (4135850898).

Almost surely, 2^16506143231 is an apocalyptic number.

16506143231 is a deficient number, since it is larger than the sum of its proper divisors (37260361).

16506143231 is an equidigital number, since it uses as much as digits as its factorization.

16506143231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37260360.

The product of its (nonzero) digits is 12960, while the sum is 32.

The spelling of 16506143231 in words is "sixteen billion, five hundred six million, one hundred forty-three thousand, two hundred thirty-one".