1661488659285 has 64 divisors (see below), whose sum is σ = 3280969359360. Its totient is φ = 699158534400.

The previous prime is 1661488659283. The next prime is 1661488659287. The reversal of 1661488659285 is 5829568841661.

It is an interprime number because it is at equal distance from previous prime (1661488659283) and next prime (1661488659287).

It is not a de Polignac number, because 1661488659285 - 2¹ = 1661488659283 is a prime.

It is a super-2 number, since 2×1661488659285² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661488659283) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1205241 + ... + 2185310.

It is an arithmetic number, because the mean of its divisors is an integer number (51265146240).

Almost surely, 2^{1661488659285} is an apocalyptic number.

1661488659285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1661488659285 is a deficient number, since it is larger than the sum of its proper divisors (1619480700075).

1661488659285 is a wasteful number, since it uses less digits than its factorization.

1661488659285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3390938.

The product of its digits is 199065600, while the sum is 69.

The spelling of 1661488659285 in words is "one trillion, six hundred sixty-one billion, four hundred eighty-eight million, six hundred fifty-nine thousand, two hundred eighty-five".