81080001887822 has 64 divisors (see below), whose sum is σ = 144513318499200. Its totient is φ = 34091439153408.

The previous prime is 81080001887821. The next prime is 81080001887831. The reversal of 81080001887822 is 22878810008018.

It is a happy number.

It is a super-2 number, since 2×81080001887822² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81080001887821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1301476178 + ... + 1301538474.

It is an arithmetic number, because the mean of its divisors is an integer number (2258020601550).

Almost surely, 2^{81080001887822} is an apocalyptic number.

81080001887822 is a deficient number, since it is larger than the sum of its proper divisors (63433316611378).

81080001887822 is a wasteful number, since it uses less digits than its factorization.

81080001887822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98170 (or 98156 counting only the distinct ones).

The product of its (nonzero) digits is 917504, while the sum is 53.

The spelling of 81080001887822 in words is "eighty-one trillion, eighty billion, one million, eight hundred eighty-seven thousand, eight hundred twenty-two".