816297432481 has 4 divisors (see below), whose sum is σ = 819800855172. Its totient is φ = 812794009792.

The previous prime is 816297432451. The next prime is 816297432529. The reversal of 816297432481 is 184234792618.

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 428293022481 + 388004410000 = 654441^2 + 622900^2 .

It is a cyclic number.

It is not a de Polignac number, because 816297432481 - 2⁵ = 816297432449 is a prime.

It is a super-2 number, since 2×816297432481² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816297432451) 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, 1751710996 + ... + 1751711461.

It is an arithmetic number, because the mean of its divisors is an integer number (204950213793).

Almost surely, 2^816297432481 is an apocalyptic number.

It is an amenable number.

816297432481 is a deficient number, since it is larger than the sum of its proper divisors (3503422691).

816297432481 is a wasteful number, since it uses less digits than its factorization.

816297432481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3503422690.

The product of its digits is 4644864, while the sum is 55.

The spelling of 816297432481 in words is "eight hundred sixteen billion, two hundred ninety-seven million, four hundred thirty-two thousand, four hundred eighty-one".