1660053521 has 8 divisors (see below), whose sum is σ = 1904055360. Its totient is φ = 1417764528.

The previous prime is 1660053511. The next prime is 1660053529. The reversal of 1660053521 is 1253500661.

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

It is a cyclic number.

It is not a de Polignac number, because 1660053521 - 2¹⁸ = 1659791377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1660053529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 426131 + ... + 430008.

It is an arithmetic number, because the mean of its divisors is an integer number (238006920).

Almost surely, 2^1660053521 is an apocalyptic number.

It is an amenable number.

1660053521 is a deficient number, since it is larger than the sum of its proper divisors (244001839).

1660053521 is an equidigital number, since it uses as much as digits as its factorization.

1660053521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 856423.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 1660053521 is about 40743.7543802728. The cubic root of 1660053521 is about 1184.0608725951.

The spelling of 1660053521 in words is "one billion, six hundred sixty million, fifty-three thousand, five hundred twenty-one".