66813549000 has 256 divisors, whose sum is σ = 231705826560. Its totient is φ = 15891200000.

The previous prime is 66813548969. The next prime is 66813549041. The reversal of 66813549000 is 94531866.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1729900 + ... + 1768100.

It is an arithmetic number, because the mean of its divisors is an integer number (905100885).

Almost surely, 2^66813549000 is an apocalyptic number.

66813549000 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 66813549000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115852913280).

66813549000 is an abundant number, since it is smaller than the sum of its proper divisors (164892277560).

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

66813549000 is a wasteful number, since it uses less digits than its factorization.

66813549000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38289 (or 38275 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 66813549000 in words is "sixty-six billion, eight hundred thirteen million, five hundred forty-nine thousand".