249745663 has 4 divisors (see below), whose sum is σ = 249777400. Its totient is φ = 249713928.

The previous prime is 249745619. The next prime is 249745669. The reversal of 249745663 is 366547942.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 366547942 = 2 ⋅183273971.

It is a cyclic number.

It is not a de Polignac number, because 249745663 - 2⁹ = 249745151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249745669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5788 + ... + 23086.

It is an arithmetic number, because the mean of its divisors is an integer number (62444350).

Almost surely, 2^249745663 is an apocalyptic number.

249745663 is a deficient number, since it is larger than the sum of its proper divisors (31737).

249745663 is a wasteful number, since it uses less digits than its factorization.

249745663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31736.

The product of its digits is 1088640, while the sum is 46.

The square root of 249745663 is about 15803.3434120758. The cubic root of 249745663 is about 629.7468227678.

The spelling of 249745663 in words is "two hundred forty-nine million, seven hundred forty-five thousand, six hundred sixty-three".