22138535945 has 16 divisors (see below), whose sum is σ = 26756125968. Its totient is φ = 17584680960.

The previous prime is 22138535941. The next prime is 22138535953. The reversal of 22138535945 is 54953583122.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 773451721 + 21365084224 = 27811^2 + 146168^2 .

It is not a de Polignac number, because 22138535945 - 2² = 22138535941 is a prime.

It is a super-3 number, since 3×22138535945³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22138535945.

It is not an unprimeable number, because it can be changed into a prime (22138535941) 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, 378827 + ... + 433343.

It is an arithmetic number, because the mean of its divisors is an integer number (1672257873).

Almost surely, 2^22138535945 is an apocalyptic number.

It is an amenable number.

22138535945 is a deficient number, since it is larger than the sum of its proper divisors (4617590023).

22138535945 is a wasteful number, since it uses less digits than its factorization.

22138535945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55100.

The product of its digits is 1296000, while the sum is 47.

The spelling of 22138535945 in words is "twenty-two billion, one hundred thirty-eight million, five hundred thirty-five thousand, nine hundred forty-five".