816231870381 has 16 divisors (see below), whose sum is σ = 1101315416256. Its totient is φ = 537690047616.

The previous prime is 816231870373. The next prime is 816231870383. The reversal of 816231870381 is 183078132618.

It is a happy number.

It is not a de Polignac number, because 816231870381 - 2³ = 816231870373 is a prime.

It is a super-2 number, since 2×816231870381² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 816231870381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816231870383) 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, 4739640 + ... + 4908833.

It is an arithmetic number, because the mean of its divisors is an integer number (68832213516).

Almost surely, 2^816231870381 is an apocalyptic number.

It is an amenable number.

816231870381 is a deficient number, since it is larger than the sum of its proper divisors (285083545875).

816231870381 is a wasteful number, since it uses less digits than its factorization.

816231870381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9648812.

The product of its (nonzero) digits is 387072, while the sum is 48.

The spelling of 816231870381 in words is "eight hundred sixteen billion, two hundred thirty-one million, eight hundred seventy thousand, three hundred eighty-one".