75447768665 has 8 divisors (see below), whose sum is σ = 92245574088. Its totient is φ = 59219380480.

The previous prime is 75447768619. The next prime is 75447768673. The reversal of 75447768665 is 56686774457.

It can be written as a sum of positive squares in 4 ways, for example, as 31365826816 + 44081941849 = 177104^2 + 209957^2 .

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

It is not a de Polignac number, because 75447768665 - 2¹⁸ = 75447506521 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142354016 + ... + 142354545.

It is an arithmetic number, because the mean of its divisors is an integer number (11530696761).

Almost surely, 2^75447768665 is an apocalyptic number.

It is an amenable number.

75447768665 is a deficient number, since it is larger than the sum of its proper divisors (16797805423).

75447768665 is a wasteful number, since it uses less digits than its factorization.

75447768665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284708619.

The product of its digits is 237081600, while the sum is 65.

The spelling of 75447768665 in words is "seventy-five billion, four hundred forty-seven million, seven hundred sixty-eight thousand, six hundred sixty-five".