166111511656809 has 32 divisors (see below), whose sum is σ = 234880232146560. Its totient is φ = 104062546271232.

The previous prime is 166111511656801. The next prime is 166111511656897. The reversal of 166111511656809 is 908656115111661.

It is not a de Polignac number, because 166111511656809 - 2³ = 166111511656801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166111511656801) 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, 106986162 + ... + 108527700.

It is an arithmetic number, because the mean of its divisors is an integer number (7340007254580).

Almost surely, 2^{166111511656809} is an apocalyptic number.

It is an amenable number.

166111511656809 is a deficient number, since it is larger than the sum of its proper divisors (68768720489751).

166111511656809 is a wasteful number, since it uses less digits than its factorization.

166111511656809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544889.

The product of its (nonzero) digits is 2332800, while the sum is 57.

The spelling of 166111511656809 in words is "one hundred sixty-six trillion, one hundred eleven billion, five hundred eleven million, six hundred fifty-six thousand, eight hundred nine".