70666889 has 2 divisors, whose sum is σ = 70666890. Its totient is φ = 70666888.

The previous prime is 70666859. The next prime is 70666891. The reversal of 70666889 is 98866607.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68890000 + 1776889 = 8300^2 + 1333^2 .

It is a cyclic number.

It is not a de Polignac number, because 70666889 - 2¹² = 70662793 is a prime.

Together with 70666891, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (70666819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35333444 + 35333445.

It is an arithmetic number, because the mean of its divisors is an integer number (35333445).

Almost surely, 2^70666889 is an apocalyptic number.

It is an amenable number.

70666889 is a deficient number, since it is larger than the sum of its proper divisors (1).

70666889 is an equidigital number, since it uses as much as digits as its factorization.

70666889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 50.

The square root of 70666889 is about 8406.3600327371. The cubic root of 70666889 is about 413.4331764671.

The spelling of 70666889 in words is "seventy million, six hundred sixty-six thousand, eight hundred eighty-nine".