16261513616 has 40 divisors (see below), whose sum is σ = 32409451704. Its totient is φ = 7898480640.

The previous prime is 16261513601. The next prime is 16261513637. The reversal of 16261513616 is 61631516261.

It can be written as a sum of positive squares in 4 ways, for example, as 14519286016 + 1742227600 = 120496^2 + 41740^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 16261513616.

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, 358046 + ... + 400898.

Almost surely, 2^16261513616 is an apocalyptic number.

16261513616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16261513616 is a deficient number, since it is larger than the sum of its proper divisors (16147938088).

16261513616 is a wasteful number, since it uses less digits than its factorization.

16261513616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43539 (or 43533 counting only the distinct ones).

The product of its digits is 38880, while the sum is 38.

The spelling of 16261513616 in words is "sixteen billion, two hundred sixty-one million, five hundred thirteen thousand, six hundred sixteen".