1321669731985 has 8 divisors (see below), whose sum is σ = 1622887485120. Its totient is φ = 1032746581104.

The previous prime is 1321669731931. The next prime is 1321669731989. The reversal of 1321669731985 is 5891379661231.

It is a happy number.

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 1321669731985 - 2⁷ = 1321669731857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1321669731989) 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, 3073650325 + ... + 3073650754.

It is an arithmetic number, because the mean of its divisors is an integer number (202860935640).

Almost surely, 2^{1321669731985} is an apocalyptic number.

It is an amenable number.

1321669731985 is a deficient number, since it is larger than the sum of its proper divisors (301217753135).

1321669731985 is an equidigital number, since it uses as much as digits as its factorization.

1321669731985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6147301127.

The product of its digits is 14696640, while the sum is 61.

The spelling of 1321669731985 in words is "one trillion, three hundred twenty-one billion, six hundred sixty-nine million, seven hundred thirty-one thousand, nine hundred eighty-five".