16660400471211 has 16 divisors (see below), whose sum is σ = 25638636089088. Its totient is φ = 9425969148000.

The previous prime is 16660400471179. The next prime is 16660400471279. The reversal of 16660400471211 is 11217400406661.

16660400471211 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 16660400471211 - 2⁵ = 16660400471179 is a prime.

It is a super-2 number, since 2×16660400471211² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16660400471211.

It is not an unprimeable number, because it can be changed into a prime (16660400471291) 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, 3927485025 + ... + 3927489266.

It is an arithmetic number, because the mean of its divisors is an integer number (1602414755568).

Almost surely, 2^{16660400471211} is an apocalyptic number.

16660400471211 is a deficient number, since it is larger than the sum of its proper divisors (8978235617877).

16660400471211 is a wasteful number, since it uses less digits than its factorization.

16660400471211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7854974402.

The product of its (nonzero) digits is 48384, while the sum is 39.

Adding to 16660400471211 its reverse (11217400406661), we get a palindrome (27877800877872).

The spelling of 16660400471211 in words is "sixteen trillion, six hundred sixty billion, four hundred million, four hundred seventy-one thousand, two hundred eleven".