1659497423 has 4 divisors (see below), whose sum is σ = 1674722280. Its totient is φ = 1644272568.

The previous prime is 1659497407. The next prime is 1659497429. The reversal of 1659497423 is 3247949561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1659497423 - 2⁴ = 1659497407 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 (1659497429) 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, 7612265 + ... + 7612482.

It is an arithmetic number, because the mean of its divisors is an integer number (418680570).

Almost surely, 2^1659497423 is an apocalyptic number.

1659497423 is a deficient number, since it is larger than the sum of its proper divisors (15224857).

1659497423 is a wasteful number, since it uses less digits than its factorization.

1659497423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15224856.

The product of its digits is 1632960, while the sum is 50.

The square root of 1659497423 is about 40736.9294743725. The cubic root of 1659497423 is about 1183.9286424364.

The spelling of 1659497423 in words is "one billion, six hundred fifty-nine million, four hundred ninety-seven thousand, four hundred twenty-three".