166911782493 has 8 divisors (see below), whose sum is σ = 224022878656. Its totient is φ = 110537604000.

The previous prime is 166911782413. The next prime is 166911782497. The reversal of 166911782493 is 394287119661.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166911782493 - 2²⁶ = 166844673629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166911782497) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184228888 + ... + 184229793.

It is an arithmetic number, because the mean of its divisors is an integer number (28002859832).

Almost surely, 2^166911782493 is an apocalyptic number.

It is an amenable number.

166911782493 is a deficient number, since it is larger than the sum of its proper divisors (57111096163).

166911782493 is a wasteful number, since it uses less digits than its factorization.

166911782493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368458835.

The product of its digits is 3919104, while the sum is 57.

The spelling of 166911782493 in words is "one hundred sixty-six billion, nine hundred eleven million, seven hundred eighty-two thousand, four hundred ninety-three".