164195837689 has 16 divisors (see below), whose sum is σ = 181793218320. Its totient is φ = 147334717440.

The previous prime is 164195837657. The next prime is 164195837711. The reversal of 164195837689 is 986738591461.

It can be written as a sum of positive squares in 8 ways, for example, as 37833362064 + 126362475625 = 194508^2 + 355475^2 .

It is a cyclic number.

It is not a de Polignac number, because 164195837689 - 2⁵ = 164195837657 is a prime.

It is a super-2 number, since 2×164195837689² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164195837609) 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, 408424 + ... + 703705.

It is an arithmetic number, because the mean of its divisors is an integer number (11362076145).

Almost surely, 2^164195837689 is an apocalyptic number.

It is an amenable number.

164195837689 is a deficient number, since it is larger than the sum of its proper divisors (17597380631).

164195837689 is a wasteful number, since it uses less digits than its factorization.

164195837689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112460.

The product of its digits is 78382080, while the sum is 67.

The spelling of 164195837689 in words is "one hundred sixty-four billion, one hundred ninety-five million, eight hundred thirty-seven thousand, six hundred eighty-nine".