66659290329984 has 256 divisors, whose sum is σ = 199410868224000. Its totient is φ = 19546272921600.

The previous prime is 66659290329977. The next prime is 66659290330019. The reversal of 66659290329984 is 48992309295666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1895920597 + ... + 1895955755.

It is an arithmetic number, because the mean of its divisors is an integer number (778948704000).

Almost surely, 2^{66659290329984} is an apocalyptic number.

66659290329984 is a gapful number since it is divisible by the number (64) 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 66659290329984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99705434112000).

66659290329984 is an abundant number, since it is smaller than the sum of its proper divisors (132751577894016).

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

66659290329984 is a wasteful number, since it uses less digits than its factorization.

66659290329984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49697 (or 49685 counting only the distinct ones).

The product of its (nonzero) digits is 2720977920, while the sum is 78.

The spelling of 66659290329984 in words is "sixty-six trillion, six hundred fifty-nine billion, two hundred ninety million, three hundred twenty-nine thousand, nine hundred eighty-four".