18670669 has 2 divisors, whose sum is σ = 18670670. Its totient is φ = 18670668.

The previous prime is 18670667. The next prime is 18670721. The reversal of 18670669 is 96607681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13053769 + 5616900 = 3613^2 + 2370^2 .

It is a cyclic number.

It is not a de Polignac number, because 18670669 - 2¹ = 18670667 is a prime.

It is a super-2 number, since 2×18670669² = 697187761815122, which contains 22 as substring.

Together with 18670667, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18670661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9335334 + 9335335.

It is an arithmetic number, because the mean of its divisors is an integer number (9335335).

Almost surely, 2^18670669 is an apocalyptic number.

It is an amenable number.

18670669 is a deficient number, since it is larger than the sum of its proper divisors (1).

18670669 is an equidigital number, since it uses as much as digits as its factorization.

18670669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 18670669 is about 4320.9569541943. The cubic root of 18670669 is about 265.2894381160.

The spelling of 18670669 in words is "eighteen million, six hundred seventy thousand, six hundred sixty-nine".