1660393740085 has 32 divisors (see below), whose sum is σ = 2221834285440. Its totient is φ = 1183781578752.

The previous prime is 1660393740067. The next prime is 1660393740091. The reversal of 1660393740085 is 5800473930661.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1660393740085 - 2⁷ = 1660393739957 is a prime.

It is a super-2 number, since 2×1660393740085² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2950297 + ... + 3467713.

It is an arithmetic number, because the mean of its divisors is an integer number (69432321420).

Almost surely, 2^{1660393740085} is an apocalyptic number.

It is an amenable number.

1660393740085 is a deficient number, since it is larger than the sum of its proper divisors (561440545355).

1660393740085 is a wasteful number, since it uses less digits than its factorization.

1660393740085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519445.

The product of its (nonzero) digits is 3265920, while the sum is 52.

The spelling of 1660393740085 in words is "one trillion, six hundred sixty billion, three hundred ninety-three million, seven hundred forty thousand, eighty-five".