166540412665 has 32 divisors (see below), whose sum is σ = 221158086912. Its totient is φ = 119376096000.

The previous prime is 166540412543. The next prime is 166540412669. The reversal of 166540412665 is 566214045661.

166540412665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 166540412665 - 2¹⁵ = 166540379897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166540412669) 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, 18790335 + ... + 18799195.

It is an arithmetic number, because the mean of its divisors is an integer number (6911190216).

Almost surely, 2^166540412665 is an apocalyptic number.

It is an amenable number.

166540412665 is a deficient number, since it is larger than the sum of its proper divisors (54617674247).

166540412665 is a wasteful number, since it uses less digits than its factorization.

166540412665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13761.

The product of its (nonzero) digits is 1036800, while the sum is 46.

The spelling of 166540412665 in words is "one hundred sixty-six billion, five hundred forty million, four hundred twelve thousand, six hundred sixty-five".