166893398661 has 16 divisors (see below), whose sum is σ = 242761481280. Its totient is φ = 101144411520.

The previous prime is 166893398657. The next prime is 166893398663.

166893398661 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 166893398661 - 2² = 166893398657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166893398592 and 166893398601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166893398663) 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, 1483161 + ... + 1591713.

It is an arithmetic number, because the mean of its divisors is an integer number (15172592580).

Almost surely, 2^166893398661 is an apocalyptic number.

166893398661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166893398661 is a deficient number, since it is larger than the sum of its proper divisors (75868082619).

166893398661 is a wasteful number, since it uses less digits than its factorization.

166893398661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155156.

The product of its digits is 60466176, while the sum is 66.

The spelling of 166893398661 in words is "one hundred sixty-six billion, eight hundred ninety-three million, three hundred ninety-eight thousand, six hundred sixty-one".