66421589850 has 1152 divisors, whose sum is σ = 250698240000. Its totient is φ = 12446784000.

The previous prime is 66421589837. The next prime is 66421589863. The reversal of 66421589850 is 5898512466.

66421589850 is a `hidden beast` number, since 6 + 6 + 4 + 2 + 1 + 589 + 8 + 50 = 666.

It is an interprime number because it is at equal distance from previous prime (66421589837) and next prime (66421589863).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 575 ways as a sum of consecutive naturals, for example, 935515315 + ... + 935515385.

It is an arithmetic number, because the mean of its divisors is an integer number (217620000).

Almost surely, 2^66421589850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66421589850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125349120000).

66421589850 is an abundant number, since it is smaller than the sum of its proper divisors (184276650150).

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

66421589850 is a wasteful number, since it uses less digits than its factorization.

66421589850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169 (or 147 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 54.

The spelling of 66421589850 in words is "sixty-six billion, four hundred twenty-one million, five hundred eighty-nine thousand, eight hundred fifty".