15444216440 has 32 divisors (see below), whose sum is σ = 36793576080. Its totient is φ = 5814292992.

The previous prime is 15444216427. The next prime is 15444216527. The reversal of 15444216440 is 4461244451.

It is a self number, because there is not a number n which added to its sum of digits gives 15444216440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11355362 + ... + 11356721.

Almost surely, 2^15444216440 is an apocalyptic number.

15444216440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15444216440 is an abundant number, since it is smaller than the sum of its proper divisors (21349359640).

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

15444216440 is a wasteful number, since it uses less digits than its factorization.

15444216440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22712111 (or 22712107 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 35.

The spelling of 15444216440 in words is "fifteen billion, four hundred forty-four million, two hundred sixteen thousand, four hundred forty".