249664157418 has 64 divisors (see below), whose sum is σ = 563354652672. Its totient is φ = 73186872000.

The previous prime is 249664157411. The next prime is 249664157473. The reversal of 249664157418 is 814751466942.

It is not an unprimeable number, because it can be changed into a prime (249664157411) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 173071 + ... + 727517.

It is an arithmetic number, because the mean of its divisors is an integer number (8802416448).

Almost surely, 2^249664157418 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 249664157418, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (281677326336).

249664157418 is an abundant number, since it is smaller than the sum of its proper divisors (313690495254).

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

249664157418 is a wasteful number, since it uses less digits than its factorization.

249664157418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554739.

The product of its digits is 11612160, while the sum is 57.

The spelling of 249664157418 in words is "two hundred forty-nine billion, six hundred sixty-four million, one hundred fifty-seven thousand, four hundred eighteen".