16261621215 has 32 divisors (see below), whose sum is σ = 29825435136. Its totient is φ = 7411409280.

The previous prime is 16261621199. The next prime is 16261621247. The reversal of 16261621215 is 51212616261.

It is not a de Polignac number, because 16261621215 - 2⁴ = 16261621199 is a prime.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 199192 + ... + 268701.

It is an arithmetic number, because the mean of its divisors is an integer number (932044848).

Almost surely, 2^16261621215 is an apocalyptic number.

16261621215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16261621215 is a deficient number, since it is larger than the sum of its proper divisors (13563813921).

16261621215 is a wasteful number, since it uses less digits than its factorization.

16261621215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468239.

The product of its digits is 8640, while the sum is 33.

The spelling of 16261621215 in words is "sixteen billion, two hundred sixty-one million, six hundred twenty-one thousand, two hundred fifteen".