16665331506 has 32 divisors (see below), whose sum is σ = 35296829568. Its totient is φ = 5227518720.

The previous prime is 16665331499. The next prime is 16665331511. The reversal of 16665331506 is 60513356661.

16665331506 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1198011 + ... + 1211841.

It is an arithmetic number, because the mean of its divisors is an integer number (1103025924).

Almost surely, 2^16665331506 is an apocalyptic number.

16665331506 is an abundant number, since it is smaller than the sum of its proper divisors (18631498062).

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

16665331506 is a wasteful number, since it uses less digits than its factorization.

16665331506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25666.

The product of its (nonzero) digits is 291600, while the sum is 42.

The spelling of 16665331506 in words is "sixteen billion, six hundred sixty-five million, three hundred thirty-one thousand, five hundred six".