74729938117861 has 4 divisors (see below), whose sum is σ = 80478394896172. Its totient is φ = 68981481339552.

The previous prime is 74729938117859. The next prime is 74729938117867. The reversal of 74729938117861 is 16871183992747.

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 34742843221636 + 39987094896225 = 5894306^2 + 6323535^2 .

It is a cyclic number.

It is not a de Polignac number, because 74729938117861 - 2¹ = 74729938117859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74729938117867) 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, 2874228389136 + ... + 2874228389161.

It is an arithmetic number, because the mean of its divisors is an integer number (20119598724043).

Almost surely, 2^{74729938117861} is an apocalyptic number.

It is an amenable number.

74729938117861 is a deficient number, since it is larger than the sum of its proper divisors (5748456778311).

74729938117861 is a wasteful number, since it uses less digits than its factorization.

74729938117861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5748456778310.

The product of its digits is 256048128, while the sum is 73.

The spelling of 74729938117861 in words is "seventy-four trillion, seven hundred twenty-nine billion, nine hundred thirty-eight million, one hundred seventeen thousand, eight hundred sixty-one".