66040822520 has 16 divisors (see below), whose sum is σ = 148591850760. Its totient is φ = 26416328992.

The previous prime is 66040822511. The next prime is 66040822531. The reversal of 66040822520 is 2522804066.

It is a super-2 number, since 2×66040822520² (a number of 22 digits) contains 22 as substring.

It is a congruent 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, 825510242 + ... + 825510321.

Almost surely, 2^66040822520 is an apocalyptic number.

It is an amenable number.

66040822520 is an abundant number, since it is smaller than the sum of its proper divisors (82551028240).

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

66040822520 is a wasteful number, since it uses less digits than its factorization.

66040822520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1651020574 (or 1651020570 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 35.

The spelling of 66040822520 in words is "sixty-six billion, forty million, eight hundred twenty-two thousand, five hundred twenty".