16403961844 has 48 divisors (see below), whose sum is σ = 30557595600. Its totient is φ = 7678494720.

The previous prime is 16403961797. The next prime is 16403961851. The reversal of 16403961844 is 44816930461.

It can be written as a sum of positive squares in 8 ways, for example, as 6245740900 + 10158220944 = 79030^2 + 100788^2 .

It is a junction number, because it is equal to n+sod(n) for n = 16403961794 and 16403961803.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16066054 + ... + 16067074.

It is an arithmetic number, because the mean of its divisors is an integer number (636616575).

Almost surely, 2^16403961844 is an apocalyptic number.

It is an amenable number.

16403961844 is a deficient number, since it is larger than the sum of its proper divisors (14153633756).

16403961844 is a wasteful number, since it uses less digits than its factorization.

16403961844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2068 (or 2066 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 46.

The spelling of 16403961844 in words is "sixteen billion, four hundred three million, nine hundred sixty-one thousand, eight hundred forty-four".