73118505781 has 16 divisors (see below), whose sum is σ = 75089734720. Its totient is φ = 71160042240.

The previous prime is 73118505773. The next prime is 73118505793. The reversal of 73118505781 is 18750581137.

It is a cyclic number.

It is not a de Polignac number, because 73118505781 - 2³ = 73118505773 is a prime.

It is a super-2 number, since 2×73118505781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73118505751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18263926 + ... + 18267928.

It is an arithmetic number, because the mean of its divisors is an integer number (4693108420).

Almost surely, 2^73118505781 is an apocalyptic number.

It is an amenable number.

73118505781 is a deficient number, since it is larger than the sum of its proper divisors (1971228939).

73118505781 is a wasteful number, since it uses less digits than its factorization.

73118505781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5476.

The product of its (nonzero) digits is 235200, while the sum is 46.

The spelling of 73118505781 in words is "seventy-three billion, one hundred eighteen million, five hundred five thousand, seven hundred eighty-one".