164995805 has 8 divisors (see below), whose sum is σ = 213225432. Its totient is φ = 121843008.

The previous prime is 164995777. The next prime is 164995811. The reversal of 164995805 is 508599461.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1104601 + 163891204 = 1051^2 + 12802^2 .

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 164995805 - 2¹² = 164991709 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 164995805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1269134 + ... + 1269263.

It is an arithmetic number, because the mean of its divisors is an integer number (26653179).

Almost surely, 2^164995805 is an apocalyptic number.

It is an amenable number.

164995805 is a deficient number, since it is larger than the sum of its proper divisors (48229627).

164995805 is a wasteful number, since it uses less digits than its factorization.

164995805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2538415.

The product of its (nonzero) digits is 388800, while the sum is 47.

The square root of 164995805 is about 12845.0692874737. The cubic root of 164995805 is about 548.4760069688.

The spelling of 164995805 in words is "one hundred sixty-four million, nine hundred ninety-five thousand, eight hundred five".