1659920041 has 4 divisors (see below), whose sum is σ = 1787606212. Its totient is φ = 1532233872.

The previous prime is 1659920027. The next prime is 1659920083. The reversal of 1659920041 is 1400299561.

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

It can be written as a sum of positive squares in 2 ways, for example, as 696748816 + 963171225 = 26396^2 + 31035^2 .

It is not a de Polignac number, because 1659920041 - 2²⁷ = 1525702313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1659921041) 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, 63843066 + ... + 63843091.

It is an arithmetic number, because the mean of its divisors is an integer number (446901553).

Almost surely, 2^1659920041 is an apocalyptic number.

It is an amenable number.

1659920041 is a deficient number, since it is larger than the sum of its proper divisors (127686171).

1659920041 is a wasteful number, since it uses less digits than its factorization.

1659920041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127686170.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 1659920041 is about 40742.1163048755. The cubic root of 1659920041 is about 1184.0291361321.

The spelling of 1659920041 in words is "one billion, six hundred fifty-nine million, nine hundred twenty thousand, forty-one".