66265822817856 has 42 divisors (see below), whose sum is σ = 189939016446582. Its totient is φ = 22088607605760.

The previous prime is 66265822817839. The next prime is 66265822817867. The reversal of 66265822817856 is 65871822856266.

66265822817856 is a `hidden beast` number, since 6 + 6 + 2 + 6 + 582 + 28 + 17 + 8 + 5 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 65456513870400 + 809308947456 = 8090520^2 + 899616^2 .

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 57522415065 + ... + 57522416216.

Almost surely, 2^{66265822817856} is an apocalyptic number.

It is an amenable number.

66265822817856 is an abundant number, since it is smaller than the sum of its proper divisors (123673193628726).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66265822817856 is a wasteful number, since it uses less digits than its factorization.

66265822817856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115044831299 (or 115044831286 counting only the distinct ones).

The product of its digits is 928972800, while the sum is 72.

The spelling of 66265822817856 in words is "sixty-six trillion, two hundred sixty-five billion, eight hundred twenty-two million, eight hundred seventeen thousand, eight hundred fifty-six".