66686231370 has 128 divisors (see below), whose sum is σ = 178865584128. Its totient is φ = 15771974400.

The previous prime is 66686231357. The next prime is 66686231383. The reversal of 66686231370 is 7313268666.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66686231357) and next prime (66686231383).

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 63 ways as a sum of consecutive naturals, for example, 15081760 + ... + 15086180.

It is an arithmetic number, because the mean of its divisors is an integer number (1397387376).

Almost surely, 2^66686231370 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66686231370, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89432792064).

66686231370 is an abundant number, since it is smaller than the sum of its proper divisors (112179352758).

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

66686231370 is a wasteful number, since it uses less digits than its factorization.

66686231370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5548.

The product of its (nonzero) digits is 1306368, while the sum is 48.

The spelling of 66686231370 in words is "sixty-six billion, six hundred eighty-six million, two hundred thirty-one thousand, three hundred seventy".