70665409 has 2 divisors, whose sum is σ = 70665410. Its totient is φ = 70665408.

The previous prime is 70665403. The next prime is 70665451. The reversal of 70665409 is 90456607.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66064384 + 4601025 = 8128^2 + 2145^2 .

It is an emirp because it is prime and its reverse (90456607) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70665409 - 2³ = 70665401 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (70665401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35332704 + 35332705.

It is an arithmetic number, because the mean of its divisors is an integer number (35332705).

Almost surely, 2^70665409 is an apocalyptic number.

It is an amenable number.

70665409 is a deficient number, since it is larger than the sum of its proper divisors (1).

70665409 is an equidigital number, since it uses as much as digits as its factorization.

70665409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 70665409 is about 8406.2720036887. The cubic root of 70665409 is about 413.4302902244.

The spelling of 70665409 in words is "seventy million, six hundred sixty-five thousand, four hundred nine".