66154948776 has 256 divisors, whose sum is σ = 215790220800. Its totient is φ = 18384537600.

The previous prime is 66154948763. The next prime is 66154948787. The reversal of 66154948776 is 67784945166.

It is a happy number.

66154948776 is a `hidden beast` number, since 6 + 6 + 1 + 549 + 4 + 87 + 7 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 23121586 + ... + 23124446.

It is an arithmetic number, because the mean of its divisors is an integer number (842930550).

Almost surely, 2^66154948776 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 66154948776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107895110400).

66154948776 is an abundant number, since it is smaller than the sum of its proper divisors (149635272024).

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

66154948776 is a wasteful number, since it uses less digits than its factorization.

66154948776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3297 (or 3287 counting only the distinct ones).

The product of its digits is 60963840, while the sum is 63.

The spelling of 66154948776 in words is "sixty-six billion, one hundred fifty-four million, nine hundred forty-eight thousand, seven hundred seventy-six".