66565006650 has 36 divisors (see below), whose sum is σ = 178837985742. Its totient is φ = 17750668320.

The previous prime is 66565006631. The next prime is 66565006663. The reversal of 66565006650 is 5660056566.

It can be written as a sum of positive squares in 3 ways, for example, as 60334588161 + 6230418489 = 245631^2 + 78933^2 .

It is a super-2 number, since 2×66565006650² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 66565006596 and 66565006605.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 73960669 + ... + 73961568.

Almost surely, 2^66565006650 is an apocalyptic number.

66565006650 is an abundant number, since it is smaller than the sum of its proper divisors (112272979092).

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

66565006650 is a wasteful number, since it uses less digits than its factorization.

66565006650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147922255 (or 147922247 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 45.

The spelling of 66565006650 in words is "sixty-six billion, five hundred sixty-five million, six thousand, six hundred fifty".