66926581920 has 1152 divisors, whose sum is σ = 282593525760. Its totient is φ = 14213283840.

The previous prime is 66926581889. The next prime is 66926581957. The reversal of 66926581920 is 2918562966.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 526980897 + ... + 526981023.

It is an arithmetic number, because the mean of its divisors is an integer number (245306880).

Almost surely, 2^66926581920 is an apocalyptic number.

66926581920 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 66926581920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141296762880).

66926581920 is an abundant number, since it is smaller than the sum of its proper divisors (215666943840).

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

66926581920 is a wasteful number, since it uses less digits than its factorization.

66926581920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298 (or 287 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

It can be divided in two parts, 66926 and 581920, that added together give a palindrome (648846).

The spelling of 66926581920 in words is "sixty-six billion, nine hundred twenty-six million, five hundred eighty-one thousand, nine hundred twenty".