66895771320 has 384 divisors, whose sum is σ = 260591385600. Its totient is φ = 15117290496.

The previous prime is 66895771309. The next prime is 66895771337. The reversal of 66895771320 is 2317759866.

66895771320 is a `hidden beast` number, since 6 + 68 + 9 + 577 + 1 + 3 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6050037 + ... + 6061083.

It is an arithmetic number, because the mean of its divisors is an integer number (678623400).

Almost surely, 2^66895771320 is an apocalyptic number.

66895771320 is a gapful number since it is divisible by the number (60) 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 66895771320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130295692800).

66895771320 is an abundant number, since it is smaller than the sum of its proper divisors (193695614280).

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

66895771320 is a wasteful number, since it uses less digits than its factorization.

66895771320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11169 (or 11153 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 54.

The spelling of 66895771320 in words is "sixty-six billion, eight hundred ninety-five million, seven hundred seventy-one thousand, three hundred twenty".