66706657626 has 64 divisors (see below), whose sum is σ = 159339552768. Its totient is φ = 18203125248.

The previous prime is 66706657621. The next prime is 66706657631. The reversal of 66706657626 is 62675660766.

It is an interprime number because it is at equal distance from previous prime (66706657621) and next prime (66706657631).

It is not an unprimeable number, because it can be changed into a prime (66706657621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 598815 + ... + 701421.

It is an arithmetic number, because the mean of its divisors is an integer number (2489680512).

Almost surely, 2^66706657626 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66706657626, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79669776384).

66706657626 is an abundant number, since it is smaller than the sum of its proper divisors (92632895142).

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

66706657626 is a wasteful number, since it uses less digits than its factorization.

66706657626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103315.

The product of its (nonzero) digits is 22861440, while the sum is 57.

The spelling of 66706657626 in words is "sixty-six billion, seven hundred six million, six hundred fifty-seven thousand, six hundred twenty-six".