164694608991 has 48 divisors (see below), whose sum is σ = 268308348000. Its totient is φ = 99770711040.

The previous prime is 164694608957. The next prime is 164694609011. The reversal of 164694608991 is 199806496461.

164694608991 is a `hidden beast` number, since 1 + 6 + 4 + 6 + 9 + 460 + 89 + 91 = 666.

It is not a de Polignac number, because 164694608991 - 2⁶ = 164694608927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164694608591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8317695 + ... + 8337471.

It is an arithmetic number, because the mean of its divisors is an integer number (5589757250).

Almost surely, 2^164694608991 is an apocalyptic number.

164694608991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

164694608991 is a deficient number, since it is larger than the sum of its proper divisors (103613739009).

164694608991 is a wasteful number, since it uses less digits than its factorization.

164694608991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22357 (or 22340 counting only the distinct ones).

The product of its (nonzero) digits is 20155392, while the sum is 63.

The spelling of 164694608991 in words is "one hundred sixty-four billion, six hundred ninety-four million, six hundred eight thousand, nine hundred ninety-one".