73764940561 has 4 divisors (see below), whose sum is σ = 79439166772. Its totient is φ = 68090714352.

The previous prime is 73764940549. The next prime is 73764940583. The reversal of 73764940561 is 16504946737.

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 17906454225 + 55858486336 = 133815^2 + 236344^2 .

It is a cyclic number.

It is not a de Polignac number, because 73764940561 - 2¹⁵ = 73764907793 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 73764940499 and 73764940508.

It is not an unprimeable number, because it can be changed into a prime (73764941561) 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, 2837113086 + ... + 2837113111.

It is an arithmetic number, because the mean of its divisors is an integer number (19859791693).

Almost surely, 2^73764940561 is an apocalyptic number.

It is an amenable number.

73764940561 is a deficient number, since it is larger than the sum of its proper divisors (5674226211).

73764940561 is a wasteful number, since it uses less digits than its factorization.

73764940561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5674226210.

The product of its (nonzero) digits is 3810240, while the sum is 52.

The spelling of 73764940561 in words is "seventy-three billion, seven hundred sixty-four million, nine hundred forty thousand, five hundred sixty-one".