15616849697856 has 189 divisors, whose sum is σ = 49205460986773. Its totient is φ = 4732062551040.

The previous prime is 15616849697809. The next prime is 15616849697887. The reversal of 15616849697856 is 65879694861651.

The square root of 15616849697856 is 3951816.

It is a perfect power (a square), and thus also a powerful number.

15616849697856 is a `hidden beast` number, since 1 + 5 + 6 + 1 + 6 + 8 + 496 + 9 + 78 + 56 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18773384256 + 15598076313600 = 137016^2 + 3949440^2 .

It is a super-3 number, since 3×15616849697856³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1043271940 + ... + 1043286908.

Almost surely, 2^{15616849697856} is an apocalyptic number.

15616849697856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

15616849697856 is the 3951816-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15616849697856

15616849697856 is an abundant number, since it is smaller than the sum of its proper divisors (33588611288917).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15616849697856 is an frugal number, since it uses more digits than its factorization.

15616849697856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29978 (or 14985 counting only the distinct ones).

The product of its digits is 4702924800, while the sum is 81.

The spelling of 15616849697856 in words is "fifteen trillion, six hundred sixteen billion, eight hundred forty-nine million, six hundred ninety-seven thousand, eight hundred fifty-six".