166904706789 has 16 divisors (see below), whose sum is σ = 247272571200. Its totient is φ = 111266952048.

The previous prime is 166904706781. The next prime is 166904706821. The reversal of 166904706789 is 987607409661.

166904706789 is a `hidden beast` number, since 1 + 6 + 6 + 90 + 470 + 6 + 78 + 9 = 666.

It is not a de Polignac number, because 166904706789 - 2³ = 166904706781 is a prime.

It is a super-2 number, since 2×166904706789² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166904706781) 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, 1829347 + ... + 1918415.

It is an arithmetic number, because the mean of its divisors is an integer number (15454535700).

Almost surely, 2^166904706789 is an apocalyptic number.

It is an amenable number.

166904706789 is a deficient number, since it is larger than the sum of its proper divisors (80367864411).

166904706789 is an equidigital number, since it uses as much as digits as its factorization.

166904706789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158481 (or 158475 counting only the distinct ones).

The product of its (nonzero) digits is 27433728, while the sum is 63.

The spelling of 166904706789 in words is "one hundred sixty-six billion, nine hundred four million, seven hundred six thousand, seven hundred eighty-nine".