66616001000 has 64 divisors (see below), whose sum is σ = 156195000000. Its totient is φ = 26592801600.

The previous prime is 66616000999. The next prime is 66616001047. The reversal of 66616001000 is 10061666.

66616001000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 432251 + ... + 565749.

It is an arithmetic number, because the mean of its divisors is an integer number (2440546875).

Almost surely, 2^66616001000 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 66616001000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78097500000).

66616001000 is an abundant number, since it is smaller than the sum of its proper divisors (89578999000).

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

66616001000 is a wasteful number, since it uses less digits than its factorization.

66616001000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134019 (or 134005 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

Adding to 66616001000 its reverse (10061666), we get a palindrome (66626062666).

The spelling of 66616001000 in words is "sixty-six billion, six hundred sixteen million, one thousand".