66601350545 has 4 divisors (see below), whose sum is σ = 79921620660. Its totient is φ = 53281080432.

The previous prime is 66601350533. The next prime is 66601350577. The reversal of 66601350545 is 54505310666.

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 52369576336 + 14231774209 = 228844^2 + 119297^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66601350545 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6660135050 + ... + 6660135059.

It is an arithmetic number, because the mean of its divisors is an integer number (19980405165).

Almost surely, 2^66601350545 is an apocalyptic number.

It is an amenable number.

66601350545 is a deficient number, since it is larger than the sum of its proper divisors (13320270115).

66601350545 is a wasteful number, since it uses less digits than its factorization.

66601350545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13320270114.

The product of its (nonzero) digits is 324000, while the sum is 41.

The spelling of 66601350545 in words is "sixty-six billion, six hundred one million, three hundred fifty thousand, five hundred forty-five".