16982232581 has 4 divisors (see below), whose sum is σ = 16986302412. Its totient is φ = 16978162752.

The previous prime is 16982232577. The next prime is 16982232593. The reversal of 16982232581 is 18523228961.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18523228961 = 223 ⋅83063807.

It can be written as a sum of positive squares in 2 ways, for example, as 7581184900 + 9401047681 = 87070^2 + 96959^2 .

It is a cyclic number.

It is not a de Polignac number, because 16982232581 - 2² = 16982232577 is a prime.

It is a super-2 number, since 2×16982232581² (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 (16982232511) 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, 2028650 + ... + 2037003.

It is an arithmetic number, because the mean of its divisors is an integer number (4246575603).

Almost surely, 2^16982232581 is an apocalyptic number.

It is an amenable number.

16982232581 is a deficient number, since it is larger than the sum of its proper divisors (4069831).

16982232581 is an equidigital number, since it uses as much as digits as its factorization.

16982232581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4069830.

The product of its digits is 414720, while the sum is 47.

The spelling of 16982232581 in words is "sixteen billion, nine hundred eighty-two million, two hundred thirty-two thousand, five hundred eighty-one".