15405449216 has 64 divisors (see below), whose sum is σ = 30960044700. Its totient is φ = 7665352704.

The previous prime is 15405449201. The next prime is 15405449239. The reversal of 15405449216 is 61294450451.

It can be written as a sum of positive squares in 2 ways, for example, as 14323302400 + 1082146816 = 119680^2 + 32896^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7502846 + ... + 7504898.

Almost surely, 2^15405449216 is an apocalyptic number.

15405449216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15405449216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15480022350).

15405449216 is an abundant number, since it is smaller than the sum of its proper divisors (15554595484).

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

15405449216 is an frugal number, since it uses more digits than its factorization.

15405449216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2312 (or 2284 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 41.

Adding to 15405449216 its reverse (61294450451), we get a palindrome (76699899667).

The spelling of 15405449216 in words is "fifteen billion, four hundred five million, four hundred forty-nine thousand, two hundred sixteen".