66660000001072 has 80 divisors (see below), whose sum is σ = 138158706880000. Its totient is φ = 31065929885952.

The previous prime is 66660000001069. The next prime is 66660000001093. The reversal of 66660000001072 is 27010000006666.

It is a super-2 number, since 2×66660000001072² (a number of 28 digits) contains 22 as substring.

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, 1892554 + ... + 11700502.

It is an arithmetic number, because the mean of its divisors is an integer number (1726983836000).

Almost surely, 2^{66660000001072} 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 66660000001072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69079353440000).

66660000001072 is an abundant number, since it is smaller than the sum of its proper divisors (71498706878928).

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

66660000001072 is a wasteful number, since it uses less digits than its factorization.

66660000001072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9808338 (or 9808332 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 34.

The spelling of 66660000001072 in words is "sixty-six trillion, six hundred sixty billion, one thousand, seventy-two".