22278249081 has 27 divisors (see below), whose sum is σ = 35378889637. Its totient is φ = 13498983960.

The previous prime is 22278249079. The next prime is 22278249101. The reversal of 22278249081 is 18094287222.

It is a happy number.

The square root of 22278249081 is 149259.

It is a perfect power (a square), and thus also a powerful number.

22278249081 is a `hidden beast` number, since 2 + 2 + 2 + 7 + 82 + 490 + 81 = 666.

It is not a de Polignac number, because 22278249081 - 2¹ = 22278249079 is a prime.

It is a super-2 number, since 2×22278249081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22278249001) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 4923286 + ... + 4927808.

Almost surely, 2^22278249081 is an apocalyptic number.

22278249081 is the 149259-th square number.

22278249081 is the 74630-th centered octagonal number.

It is an amenable number.

22278249081 is a deficient number, since it is larger than the sum of its proper divisors (13100640556).

22278249081 is an frugal number, since it uses more digits than its factorization.

22278249081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9074 (or 4537 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The spelling of 22278249081 in words is "twenty-two billion, two hundred seventy-eight million, two hundred forty-nine thousand, eighty-one".