264440440406 has 4 divisors (see below), whose sum is σ = 396660660612. Its totient is φ = 132220220202.

The previous prime is 264440440387. The next prime is 264440440427. The reversal of 264440440406 is 604044044462.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 264440440406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66110110100 + ... + 66110110103.

It is an arithmetic number, because the mean of its divisors is an integer number (99165165153).

Almost surely, 2^264440440406 is an apocalyptic number.

264440440406 is a deficient number, since it is larger than the sum of its proper divisors (132220220206).

264440440406 is a wasteful number, since it uses less digits than its factorization.

264440440406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132220220205.

The product of its (nonzero) digits is 294912, while the sum is 38.

Adding to 264440440406 its reverse (604044044462), we get a palindrome (868484484868).

The spelling of 264440440406 in words is "two hundred sixty-four billion, four hundred forty million, four hundred forty thousand, four hundred six".