70666109 has 2 divisors, whose sum is σ = 70666110. Its totient is φ = 70666108.

The previous prime is 70666103. The next prime is 70666133. The reversal of 70666109 is 90166607.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50836900 + 19829209 = 7130^2 + 4453^2 .

It is a cyclic number.

It is not a de Polignac number, because 70666109 - 2⁸ = 70665853 is a prime.

It is a super-2 number, since 2×70666109² = 9987397922399762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70666103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35333054 + 35333055.

It is an arithmetic number, because the mean of its divisors is an integer number (35333055).

Almost surely, 2^70666109 is an apocalyptic number.

It is an amenable number.

70666109 is a deficient number, since it is larger than the sum of its proper divisors (1).

70666109 is an equidigital number, since it uses as much as digits as its factorization.

70666109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 70666109 is about 8406.3136391643. The cubic root of 70666109 is about 413.4316553443.

The spelling of 70666109 in words is "seventy million, six hundred sixty-six thousand, one hundred nine".