1659267397 has 4 divisors (see below), whose sum is σ = 1746597280. Its totient is φ = 1571937516.

The previous prime is 1659267383. The next prime is 1659267409. The reversal of 1659267397 is 7937629561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1659267397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1659267307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43664913 + ... + 43664950.

It is an arithmetic number, because the mean of its divisors is an integer number (436649320).

Almost surely, 2^1659267397 is an apocalyptic number.

It is an amenable number.

1659267397 is a deficient number, since it is larger than the sum of its proper divisors (87329883).

1659267397 is an equidigital number, since it uses as much as digits as its factorization.

1659267397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87329882.

The product of its digits is 4286520, while the sum is 55.

The square root of 1659267397 is about 40734.1060660474. The cubic root of 1659267397 is about 1183.8739377308.

The spelling of 1659267397 in words is "one billion, six hundred fifty-nine million, two hundred sixty-seven thousand, three hundred ninety-seven".