1660135720319 has 8 divisors (see below), whose sum is σ = 1670110202880. Its totient is φ = 1650161637496.

The previous prime is 1660135720303. The next prime is 1660135720337. The reversal of 1660135720319 is 9130275310661.

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 1660135720319 - 2⁴ = 1660135720303 is a prime.

It is a super-2 number, since 2×1660135720319² (a number of 25 digits) contains 22 as substring.

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 1660135720319.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660135720339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15718682 + ... + 15823944.

It is an arithmetic number, because the mean of its divisors is an integer number (208763775360).

Almost surely, 2^{1660135720319} is an apocalyptic number.

1660135720319 is a deficient number, since it is larger than the sum of its proper divisors (9974482561).

1660135720319 is a wasteful number, since it uses less digits than its factorization.

1660135720319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199869.

The product of its (nonzero) digits is 204120, while the sum is 44.

The spelling of 1660135720319 in words is "one trillion, six hundred sixty billion, one hundred thirty-five million, seven hundred twenty thousand, three hundred nineteen".