66330677556 has 288 divisors, whose sum is σ = 204343566336. Its totient is φ = 17866656000.

The previous prime is 66330677551. The next prime is 66330677563. The reversal of 66330677556 is 65577603366.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66330677551) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 36225561 + ... + 36227391.

It is an arithmetic number, because the mean of its divisors is an integer number (709526272).

Almost surely, 2^66330677556 is an apocalyptic number.

66330677556 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66330677556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102171783168).

66330677556 is an abundant number, since it is smaller than the sum of its proper divisors (138012888780).

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

66330677556 is a wasteful number, since it uses less digits than its factorization.

66330677556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2123 (or 2118 counting only the distinct ones).

The product of its (nonzero) digits is 14288400, while the sum is 54.

The spelling of 66330677556 in words is "sixty-six billion, three hundred thirty million, six hundred seventy-seven thousand, five hundred fifty-six".