166705516515 has 16 divisors (see below), whose sum is σ = 266878464768. Its totient is φ = 88859729376.

The previous prime is 166705516513. The next prime is 166705516541. The reversal of 166705516515 is 515615507661.

It is not a de Polignac number, because 166705516515 - 2¹ = 166705516513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166705516513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3089829 + ... + 3143318.

It is an arithmetic number, because the mean of its divisors is an integer number (16679904048).

Almost surely, 2^166705516515 is an apocalyptic number.

166705516515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166705516515 is a deficient number, since it is larger than the sum of its proper divisors (100172948253).

166705516515 is a wasteful number, since it uses less digits than its factorization.

166705516515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6234938.

The product of its (nonzero) digits is 945000, while the sum is 48.

The spelling of 166705516515 in words is "one hundred sixty-six billion, seven hundred five million, five hundred sixteen thousand, five hundred fifteen".