22978212065 has 16 divisors (see below), whose sum is σ = 27835539600. Its totient is φ = 18208219392.

The previous prime is 22978212053. The next prime is 22978212067. The reversal of 22978212065 is 56021287922.

It can be written as a sum of positive squares in 8 ways, for example, as 125238481 + 22852973584 = 11191^2 + 151172^2 .

It is a cyclic number.

It is not a de Polignac number, because 22978212065 - 2¹² = 22978207969 is a prime.

It is a super-2 number, since 2×22978212065² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22978212067) 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, 2946191 + ... + 2953979.

It is an arithmetic number, because the mean of its divisors is an integer number (1739721225).

Almost surely, 2^22978212065 is an apocalyptic number.

It is an amenable number.

22978212065 is a deficient number, since it is larger than the sum of its proper divisors (4857327535).

22978212065 is a wasteful number, since it uses less digits than its factorization.

22978212065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13316.

The product of its (nonzero) digits is 241920, while the sum is 44.

Adding to 22978212065 its reverse (56021287922), we get a palindrome (78999499987).

The spelling of 22978212065 in words is "twenty-two billion, nine hundred seventy-eight million, two hundred twelve thousand, sixty-five".