73856665837 has 4 divisors (see below), whose sum is σ = 73876120956. Its totient is φ = 73837210720.

The previous prime is 73856665781. The next prime is 73856665843.

73856665837 is nontrivially palindromic in base 10.

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 1997285481 + 71859380356 = 44691^2 + 268066^2 .

It is a cyclic number.

It is not a de Polignac number, because 73856665837 - 2²³ = 73848277229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73856665847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9721864 + ... + 9729457.

It is an arithmetic number, because the mean of its divisors is an integer number (18469030239).

Almost surely, 2^73856665837 is an apocalyptic number.

It is an amenable number.

73856665837 is a deficient number, since it is larger than the sum of its proper divisors (19455119).

73856665837 is a wasteful number, since it uses less digits than its factorization.

73856665837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19455118.

The product of its digits is 152409600, while the sum is 64.

The spelling of 73856665837 in words is "seventy-three billion, eight hundred fifty-six million, six hundred sixty-five thousand, eight hundred thirty-seven".