164778149 has 8 divisors (see below), whose sum is σ = 167323968. Its totient is φ = 162238720.

The previous prime is 164778143. The next prime is 164778151. The reversal of 164778149 is 941877461.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 164778149 - 2²⁴ = 148000933 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 (164778143) 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, 85454 + ... + 87360.

It is an arithmetic number, because the mean of its divisors is an integer number (20915496).

Almost surely, 2^164778149 is an apocalyptic number.

It is an amenable number.

164778149 is a deficient number, since it is larger than the sum of its proper divisors (2545819).

164778149 is a wasteful number, since it uses less digits than its factorization.

164778149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3195.

The product of its digits is 338688, while the sum is 47.

The square root of 164778149 is about 12836.5941355174. The cubic root of 164778149 is about 548.2347248229.

The spelling of 164778149 in words is "one hundred sixty-four million, seven hundred seventy-eight thousand, one hundred forty-nine".