66931629270 has 128 divisors (see below), whose sum is σ = 185639938560. Its totient is φ = 15273722880.

The previous prime is 66931629241. The next prime is 66931629277. The reversal of 66931629270 is 7292613966.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66931629277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 950394 + ... + 1018386.

It is an arithmetic number, because the mean of its divisors is an integer number (1450312020).

Almost surely, 2^66931629270 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66931629270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92819969280).

66931629270 is an abundant number, since it is smaller than the sum of its proper divisors (118708309290).

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

66931629270 is a wasteful number, since it uses less digits than its factorization.

66931629270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68190.

The product of its (nonzero) digits is 1469664, while the sum is 51.

The spelling of 66931629270 in words is "sixty-six billion, nine hundred thirty-one million, six hundred twenty-nine thousand, two hundred seventy".