249864387771 has 32 divisors (see below), whose sum is σ = 364254105600. Its totient is φ = 151668080640.

The previous prime is 249864387767. The next prime is 249864387791. The reversal of 249864387771 is 177783468942.

It is not a de Polignac number, because 249864387771 - 2² = 249864387767 is a prime.

It is not an unprimeable number, because it can be changed into a prime (249864387791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4842235 + ... + 4893563.

It is an arithmetic number, because the mean of its divisors is an integer number (11382940800).

Almost surely, 2^249864387771 is an apocalyptic number.

249864387771 is a deficient number, since it is larger than the sum of its proper divisors (114389717829).

249864387771 is a wasteful number, since it uses less digits than its factorization.

249864387771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54459.

The product of its digits is 113799168, while the sum is 66.

The spelling of 249864387771 in words is "two hundred forty-nine billion, eight hundred sixty-four million, three hundred eighty-seven thousand, seven hundred seventy-one".