164719892065 has 4 divisors (see below), whose sum is σ = 197663870484. Its totient is φ = 131775913648.

The previous prime is 164719892047. The next prime is 164719892069. The reversal of 164719892065 is 560298917461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20371567441 + 144348324624 = 142729^2 + 379932^2 .

It is a cyclic number.

It is not a de Polignac number, because 164719892065 - 2¹⁷ = 164719760993 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164719892069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16471989202 + ... + 16471989211.

It is an arithmetic number, because the mean of its divisors is an integer number (49415967621).

Almost surely, 2^164719892065 is an apocalyptic number.

It is an amenable number.

164719892065 is a deficient number, since it is larger than the sum of its proper divisors (32943978419).

164719892065 is an equidigital number, since it uses as much as digits as its factorization.

164719892065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32943978418.

The product of its (nonzero) digits is 6531840, while the sum is 58.

It can be divided in two parts, 164719 and 892065, that added together give a square (1056784 = 1028²).

The spelling of 164719892065 in words is "one hundred sixty-four billion, seven hundred nineteen million, eight hundred ninety-two thousand, sixty-five".