73940066543281 has 9 divisors (see below), whose sum is σ = 74638482181081. Its totient is φ = 73248126406852.

The previous prime is 73940066543251. The next prime is 73940066543341. The reversal of 73940066543281 is 18234566004937.

The square root of 73940066543281 is 8598841.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 73940066543281 - 2¹³ = 73940066535089 is a prime.

It is a super-2 number, since 2×73940066543281² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73940066543251) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 920035806 + ... + 920116168.

It is a 1-persistent number, because it is pandigital, but 2⋅73940066543281 = 147880133086562 is not.

Almost surely, 2^{73940066543281} is an apocalyptic number.

73940066543281 is the 8598841-st square number.

73940066543281 is the 4299421-st centered octagonal number.

It is an amenable number.

73940066543281 is a deficient number, since it is larger than the sum of its proper divisors (698415637800).

73940066543281 is an frugal number, since it uses more digits than its factorization.

73940066543281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160940 (or 80470 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 58.

The spelling of 73940066543281 in words is "seventy-three trillion, nine hundred forty billion, sixty-six million, five hundred forty-three thousand, two hundred eighty-one".