16440642236 has 24 divisors (see below), whose sum is σ = 30319307424. Its totient is φ = 7785060800.

The previous prime is 16440642233. The next prime is 16440642287. The reversal of 16440642236 is 63224604461.

It is a super-3 number, since 3×16440642236³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16440642236.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16440642233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 875375 + ... + 893958.

It is an arithmetic number, because the mean of its divisors is an integer number (1263304476).

Almost surely, 2^16440642236 is an apocalyptic number.

It is an amenable number.

16440642236 is a deficient number, since it is larger than the sum of its proper divisors (13878665188).

16440642236 is a wasteful number, since it uses less digits than its factorization.

16440642236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1769461 (or 1769459 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 38.

The spelling of 16440642236 in words is "sixteen billion, four hundred forty million, six hundred forty-two thousand, two hundred thirty-six".