16661333415 has 32 divisors (see below), whose sum is σ = 28081785600. Its totient is φ = 8412180480.

The previous prime is 16661333407. The next prime is 16661333417. The reversal of 16661333415 is 51433316661.

It is not a de Polignac number, because 16661333415 - 2³ = 16661333407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16661333417) by changing a digit.

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, 380820 + ... + 422310.

It is an arithmetic number, because the mean of its divisors is an integer number (877555800).

Almost surely, 2^16661333415 is an apocalyptic number.

16661333415 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16661333415 is a deficient number, since it is larger than the sum of its proper divisors (11420452185).

16661333415 is a wasteful number, since it uses less digits than its factorization.

16661333415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42927.

The product of its digits is 116640, while the sum is 39.

It can be divided in two parts, 166613 and 33415, that added together give a triangular number (200028 = T₆₃₂).

The spelling of 16661333415 in words is "sixteen billion, six hundred sixty-one million, three hundred thirty-three thousand, four hundred fifteen".