73805761681 has 4 divisors (see below), whose sum is σ = 78147277092. Its totient is φ = 69464246272.

The previous prime is 73805761633. The next prime is 73805761693. The reversal of 73805761681 is 18616750837.

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 52494141456 + 21311620225 = 229116^2 + 145985^2 .

It is a cyclic number.

It is not a de Polignac number, because 73805761681 - 2¹⁷ = 73805630609 is a prime.

It is a super-2 number, since 2×73805761681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73805761621) 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, 2170757680 + ... + 2170757713.

It is an arithmetic number, because the mean of its divisors is an integer number (19536819273).

Almost surely, 2^73805761681 is an apocalyptic number.

It is an amenable number.

73805761681 is a deficient number, since it is larger than the sum of its proper divisors (4341515411).

73805761681 is a wasteful number, since it uses less digits than its factorization.

73805761681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4341515410.

The product of its (nonzero) digits is 1693440, while the sum is 52.

The spelling of 73805761681 in words is "seventy-three billion, eight hundred five million, seven hundred sixty-one thousand, six hundred eighty-one".