81143352469 has 16 divisors (see below), whose sum is σ = 83989509120. Its totient is φ = 78311796480.

The previous prime is 81143352461. The next prime is 81143352491. The reversal of 81143352469 is 96425334118.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 81143352469 - 2³ = 81143352461 is a prime.

It is a super-2 number, since 2×81143352469² (a number of 23 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 (81143352461) 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, 25127947 + ... + 25131175.

It is an arithmetic number, because the mean of its divisors is an integer number (5249344320).

Almost surely, 2^81143352469 is an apocalyptic number.

It is an amenable number.

81143352469 is a deficient number, since it is larger than the sum of its proper divisors (2846156651).

81143352469 is a wasteful number, since it uses less digits than its factorization.

81143352469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5220.

The product of its digits is 622080, while the sum is 46.

The spelling of 81143352469 in words is "eighty-one billion, one hundred forty-three million, three hundred fifty-two thousand, four hundred sixty-nine".