666680070 has 128 divisors (see below), whose sum is σ = 1932263424. Its totient is φ = 143915904.

The previous prime is 666680033. The next prime is 666680071. The reversal of 666680070 is 70086666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666680071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 400059 + ... + 401721.

It is an arithmetic number, because the mean of its divisors is an integer number (15095808).

Almost surely, 2^666680070 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666680070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (966131712).

666680070 is an abundant number, since it is smaller than the sum of its proper divisors (1265583354).

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

666680070 is a wasteful number, since it uses less digits than its factorization.

666680070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1786.

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 666680070 is about 25820.1485278455. The cubic root of 666680070 is about 873.5863191421.

It can be divided in two parts, 6666 and 80070, that added together give a triangular number (86736 = T₄₁₆).

The spelling of 666680070 in words is "six hundred sixty-six million, six hundred eighty thousand, seventy".