66156066522 has 480 divisors, whose sum is σ = 199262536704. Its totient is φ = 15956352000.

The previous prime is 66156066497. The next prime is 66156066527. The reversal of 66156066522 is 22566065166.

It is a happy number.

66156066522 is a `hidden beast` number, since 6 + 6 + 1 + 5 + 60 + 66 + 522 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66156066527) by changing a digit.

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 239 ways as a sum of consecutive naturals, for example, 164977522 + ... + 164977922.

Almost surely, 2^66156066522 is an apocalyptic number.

66156066522 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 66156066522, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99631268352).

66156066522 is an abundant number, since it is smaller than the sum of its proper divisors (133106470182).

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

66156066522 is a wasteful number, since it uses less digits than its factorization.

66156066522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504 (or 476 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 66156066522 in words is "sixty-six billion, one hundred fifty-six million, sixty-six thousand, five hundred twenty-two".