66605464745 has 8 divisors (see below), whose sum is σ = 79957830984. Its totient is φ = 53263522944.

The previous prime is 66605464711. The next prime is 66605464787. The reversal of 66605464745 is 54746450666.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 39400729 + 66566064016 = 6277^2 + 258004^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 66605464745 - 2²⁰ = 66604416169 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, 2592044 + ... + 2617613.

It is an arithmetic number, because the mean of its divisors is an integer number (9994728873).

Almost surely, 2^66605464745 is an apocalyptic number.

It is an amenable number.

66605464745 is a deficient number, since it is larger than the sum of its proper divisors (13352366239).

66605464745 is a wasteful number, since it uses less digits than its factorization.

66605464745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5212219.

The product of its (nonzero) digits is 14515200, while the sum is 53.

The spelling of 66605464745 in words is "sixty-six billion, six hundred five million, four hundred sixty-four thousand, seven hundred forty-five".