66770331648 has 96 divisors (see below), whose sum is σ = 178236676800. Its totient is φ = 22228533248.

The previous prime is 66770331629. The next prime is 66770331689. The reversal of 66770331648 is 84613307766.

It is a tau number, because it is divible by the number of its divisors (96).

It is a self number, because there is not a number n which added to its sum of digits gives 66770331648.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5148340 + ... + 5161292.

It is an arithmetic number, because the mean of its divisors is an integer number (1856632050).

Almost surely, 2^66770331648 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 66770331648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89118338400).

66770331648 is an abundant number, since it is smaller than the sum of its proper divisors (111466345152).

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

66770331648 is a wasteful number, since it uses less digits than its factorization.

66770331648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13817 (or 13797 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 51.

The spelling of 66770331648 in words is "sixty-six billion, seven hundred seventy million, three hundred thirty-one thousand, six hundred forty-eight".