1660085557 has 16 divisors (see below), whose sum is σ = 1880299008. Its totient is φ = 1454955840.

The previous prime is 1660085533. The next prime is 1660085593. The reversal of 1660085557 is 7555800661.

It is a de Polignac number, because none of the positive numbers 2^k-1660085557 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 (1660085507) 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 15 ways as a sum of consecutive naturals, for example, 17503 + ... + 60220.

It is an arithmetic number, because the mean of its divisors is an integer number (117518688).

Almost surely, 2^1660085557 is an apocalyptic number.

It is an amenable number.

1660085557 is a deficient number, since it is larger than the sum of its proper divisors (220213451).

1660085557 is a wasteful number, since it uses less digits than its factorization.

1660085557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77820.

The product of its (nonzero) digits is 252000, while the sum is 43.

The square root of 1660085557 is about 40744.1475183860. The cubic root of 1660085557 is about 1184.0684892833.

The spelling of 1660085557 in words is "one billion, six hundred sixty million, eighty-five thousand, five hundred fifty-seven".