66157772772 has 192 divisors, whose sum is σ = 197056832000. Its totient is φ = 17161320960.

The previous prime is 66157772641. The next prime is 66157772827. The reversal of 66157772772 is 27727775166.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3253854 + ... + 3274122.

Almost surely, 2^66157772772 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66157772772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98528416000).

66157772772 is an abundant number, since it is smaller than the sum of its proper divisors (130899059228).

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

66157772772 is a wasteful number, since it uses less digits than its factorization.

66157772772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20371 (or 20355 counting only the distinct ones).

The product of its digits is 12101040, while the sum is 57.

The spelling of 66157772772 in words is "sixty-six billion, one hundred fifty-seven million, seven hundred seventy-two thousand, seven hundred seventy-two".