1659478399 has 2 divisors, whose sum is σ = 1659478400. Its totient is φ = 1659478398.

The previous prime is 1659478367. The next prime is 1659478417. The reversal of 1659478399 is 9938749561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1659478399 - 2⁵ = 1659478367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1659478349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 829739199 + 829739200.

It is an arithmetic number, because the mean of its divisors is an integer number (829739200).

Almost surely, 2^1659478399 is an apocalyptic number.

1659478399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1659478399 is an equidigital number, since it uses as much as digits as its factorization.

1659478399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14696640, while the sum is 61.

The square root of 1659478399 is about 40736.6959754961. The cubic root of 1659478399 is about 1183.9241183469.

The spelling of 1659478399 in words is "one billion, six hundred fifty-nine million, four hundred seventy-eight thousand, three hundred ninety-nine".