1660375591 has 8 divisors (see below), whose sum is σ = 1997444480. Its totient is φ = 1348274808.

The previous prime is 1660375579. The next prime is 1660375649. The reversal of 1660375591 is 1955730661.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1660375591 - 2⁵ = 1660375559 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 (1660375501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6241881 + ... + 6242146.

It is an arithmetic number, because the mean of its divisors is an integer number (249680560).

Almost surely, 2^1660375591 is an apocalyptic number.

1660375591 is a deficient number, since it is larger than the sum of its proper divisors (337068889).

1660375591 is a wasteful number, since it uses less digits than its factorization.

1660375591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12484053.

The product of its (nonzero) digits is 170100, while the sum is 43.

The square root of 1660375591 is about 40747.7065734993. The cubic root of 1660375591 is about 1184.1374415773.

The spelling of 1660375591 in words is "one billion, six hundred sixty million, three hundred seventy-five thousand, five hundred ninety-one".