73699840121985 has 72 divisors (see below), whose sum is σ = 160474803478080. Its totient is φ = 30628504969920.

The previous prime is 73699840121923. The next prime is 73699840121989. The reversal of 73699840121985 is 58912104899637.

73699840121985 is a `hidden beast` number, since 7 + 36 + 9 + 98 + 401 + 21 + 9 + 85 = 666.

It is not a de Polignac number, because 73699840121985 - 2⁹ = 73699840121473 is a prime.

It is a super-2 number, since 2×73699840121985² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (73699840121989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 966770755 + ... + 966846984.

It is a 1-persistent number, because it is pandigital, but 2⋅73699840121985 = 147399680243970 is not.

Almost surely, 2^{73699840121985} is an apocalyptic number.

It is an amenable number.

73699840121985 is an abundant number, since it is smaller than the sum of its proper divisors (86774963356095).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

73699840121985 is a wasteful number, since it uses less digits than its factorization.

73699840121985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1933617779 (or 1933617765 counting only the distinct ones).

The product of its (nonzero) digits is 235146240, while the sum is 72.

The spelling of 73699840121985 in words is "seventy-three trillion, six hundred ninety-nine billion, eight hundred forty million, one hundred twenty-one thousand, nine hundred eighty-five".