249999999066 has 96 divisors (see below), whose sum is σ = 580007243088. Its totient is φ = 77547110400.

The previous prime is 249999999061. The next prime is 249999999077. The reversal of 249999999066 is 660999999942.

It can be written as a sum of positive squares in 8 ways, for example, as 109584171225 + 140415827841 = 331035^2 + 374721^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (249999999061) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 35644576 + ... + 35651588.

Almost surely, 2^249999999066 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 249999999066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290003621544).

249999999066 is an abundant number, since it is smaller than the sum of its proper divisors (330007244022).

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

249999999066 is a wasteful number, since it uses less digits than its factorization.

249999999066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8336 (or 8333 counting only the distinct ones).

The product of its (nonzero) digits is 1377495072, while the sum is 81.

The spelling of 249999999066 in words is "two hundred forty-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, sixty-six".