249668631522 has 18 divisors (see below), whose sum is σ = 540953294817. Its totient is φ = 83222170536.

The previous prime is 249668631481. The next prime is 249668631523. The reversal of 249668631522 is 225136866942.

249668631522 is a `hidden beast` number, since 2 + 4 + 9 + 6 + 6 + 86 + 31 + 522 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 239376326121 + 10292305401 = 489261^2 + 101451^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=353319.

It is not an unprimeable number, because it can be changed into a prime (249668631523) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2061028 + ... + 2178800.

Almost surely, 2^249668631522 is an apocalyptic number.

249668631522 is an abundant number, since it is smaller than the sum of its proper divisors (291284663295).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

249668631522 is an frugal number, since it uses more digits than its factorization.

249668631522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235554 (or 117778 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 54.

The spelling of 249668631522 in words is "two hundred forty-nine billion, six hundred sixty-eight million, six hundred thirty-one thousand, five hundred twenty-two".