1516991863121 has 8 divisors (see below), whose sum is σ = 1789630953984. Its totient is φ = 1258334264160.

The previous prime is 1516991863097. The next prime is 1516991863129. The reversal of 1516991863121 is 1213681996151.

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 1516991863121 - 2²² = 1516987668817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1516991863129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3495372740 + ... + 3495373173.

It is an arithmetic number, because the mean of its divisors is an integer number (223703869248).

Almost surely, 2^{1516991863121} is an apocalyptic number.

It is an amenable number.

1516991863121 is a deficient number, since it is larger than the sum of its proper divisors (272639090863).

1516991863121 is an equidigital number, since it uses as much as digits as its factorization.

1516991863121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6990745951.

The product of its digits is 699840, while the sum is 53.

The spelling of 1516991863121 in words is "one trillion, five hundred sixteen billion, nine hundred ninety-one million, eight hundred sixty-three thousand, one hundred twenty-one".