16660400465511 has 32 divisors (see below), whose sum is σ = 27794477168640. Its totient is φ = 9771495868800.

The previous prime is 16660400465497. The next prime is 16660400465519. The reversal of 16660400465511 is 11556400406661.

It is not a de Polignac number, because 16660400465511 - 2⁵ = 16660400465479 is a prime.

It is a super-2 number, since 2×16660400465511² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16660400465519) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 904758930 + ... + 904777343.

It is an arithmetic number, because the mean of its divisors is an integer number (868577411520).

Almost surely, 2^{16660400465511} is an apocalyptic number.

16660400465511 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16660400465511 is a deficient number, since it is larger than the sum of its proper divisors (11134076703129).

16660400465511 is a wasteful number, since it uses less digits than its factorization.

16660400465511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1809536324 (or 1809536318 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The spelling of 16660400465511 in words is "sixteen trillion, six hundred sixty billion, four hundred million, four hundred sixty-five thousand, five hundred eleven".