66865597045 has 8 divisors (see below), whose sum is σ = 86410925496. Its totient is φ = 49377671616.

The previous prime is 66865597039. The next prime is 66865597177. The reversal of 66865597045 is 54079556866.

It can be written as a sum of positive squares in 4 ways, for example, as 9093148164 + 57772448881 = 95358^2 + 240359^2 .

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

It is not a de Polignac number, because 66865597045 - 2⁵ = 66865597013 is a prime.

It is a Duffinian number.

It is a congruent 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, 514350682 + ... + 514350811.

It is an arithmetic number, because the mean of its divisors is an integer number (10801365687).

Almost surely, 2^66865597045 is an apocalyptic number.

66865597045 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66865597045 is a deficient number, since it is larger than the sum of its proper divisors (19545328451).

66865597045 is a wasteful number, since it uses less digits than its factorization.

66865597045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1028701511.

The product of its (nonzero) digits is 54432000, while the sum is 61.

The spelling of 66865597045 in words is "sixty-six billion, eight hundred sixty-five million, five hundred ninety-seven thousand, forty-five".