22378435681 has 24 divisors (see below), whose sum is σ = 26376900480. Its totient is φ = 18927976032.

The previous prime is 22378435669. The next prime is 22378435687. The reversal of 22378435681 is 18653487322.

It is not a de Polignac number, because 22378435681 - 2²¹ = 22376338529 is a prime.

It is a super-2 number, since 2×22378435681² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (22378435687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4052040 + ... + 4057558.

It is an arithmetic number, because the mean of its divisors is an integer number (1099037520).

Almost surely, 2^22378435681 is an apocalyptic number.

It is an amenable number.

22378435681 is a deficient number, since it is larger than the sum of its proper divisors (3998464799).

22378435681 is an equidigital number, since it uses as much as digits as its factorization.

22378435681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6613 (or 6606 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 49.

The spelling of 22378435681 in words is "twenty-two billion, three hundred seventy-eight million, four hundred thirty-five thousand, six hundred eighty-one".