73739339889821 has 8 divisors (see below), whose sum is σ = 78110414490744. Its totient is φ = 69371983774720.

The previous prime is 73739339889791. The next prime is 73739339889847. The reversal of 73739339889821 is 12898893393737.

It can be written as a sum of positive squares in 4 ways, for example, as 2598785805625 + 71140554084196 = 1612075^2 + 8434486^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 73739339889821 - 2¹⁸ = 73739339627677 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 (73739339889521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 929580620 + ... + 929659941.

It is an arithmetic number, because the mean of its divisors is an integer number (9763801811343).

Almost surely, 2^{73739339889821} is an apocalyptic number.

It is an amenable number.

73739339889821 is a deficient number, since it is larger than the sum of its proper divisors (4371074600923).

73739339889821 is a wasteful number, since it uses less digits than its factorization.

73739339889821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1859242911.

The product of its digits is 2962842624, while the sum is 80.

The spelling of 73739339889821 in words is "seventy-three trillion, seven hundred thirty-nine billion, three hundred thirty-nine million, eight hundred eighty-nine thousand, eight hundred twenty-one".