1659044137 has 4 divisors (see below), whose sum is σ = 1668312720. Its totient is φ = 1649775556.

The previous prime is 1659044087. The next prime is 1659044159. The reversal of 1659044137 is 7314409561.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7314409561 = 23 ⋅318017807.

It is a cyclic number.

It is not a de Polignac number, because 1659044137 - 2²³ = 1650655529 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1659044137.

It is not an unprimeable number, because it can be changed into a prime (1659044237) 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, 4634023 + ... + 4634380.

It is an arithmetic number, because the mean of its divisors is an integer number (417078180).

Almost surely, 2^1659044137 is an apocalyptic number.

It is an amenable number.

1659044137 is a deficient number, since it is larger than the sum of its proper divisors (9268583).

1659044137 is an equidigital number, since it uses as much as digits as its factorization.

1659044137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9268582.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 1659044137 is about 40731.3655184797. The cubic root of 1659044137 is about 1183.8208372779.

The spelling of 1659044137 in words is "one billion, six hundred fifty-nine million, forty-four thousand, one hundred thirty-seven".