670818409 has 2 divisors, whose sum is σ = 670818410. Its totient is φ = 670818408.

The previous prime is 670818397. The next prime is 670818433. The reversal of 670818409 is 904818076.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 624850009 + 45968400 = 24997^2 + 6780^2 .

It is a cyclic number.

It is not a de Polignac number, because 670818409 - 2¹⁵ = 670785641 is a prime.

It is equal to p_34818676 and since 670818409 and 34818676 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (670818479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335409204 + 335409205.

It is an arithmetic number, because the mean of its divisors is an integer number (335409205).

Almost surely, 2^670818409 is an apocalyptic number.

It is an amenable number.

670818409 is a deficient number, since it is larger than the sum of its proper divisors (1).

670818409 is an equidigital number, since it uses as much as digits as its factorization.

670818409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 670818409 is about 25900.1623353986. The cubic root of 670818409 is about 875.3901537364.

The spelling of 670818409 in words is "six hundred seventy million, eight hundred eighteen thousand, four hundred nine".