16378896997225 has 27 divisors (see below), whose sum is σ = 23625927582231. Its totient is φ = 11231146525200.

The previous prime is 16378896997159. The next prime is 16378896997249. The reversal of 16378896997225 is 52279969887361.

The square root of 16378896997225 is 4047085.

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

It can be written as a sum of positive squares in only one way, i.e., 5896402919001 + 10482494078224 = 2428251^2 + 3237668^2 .

It is not a de Polignac number, because 16378896997225 - 2²¹ = 16378894900073 is a prime.

It is a super-2 number, since 2×16378896997225² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 141590160 + ... + 141705790.

Almost surely, 2^{16378896997225} is an apocalyptic number.

16378896997225 is the 4047085-th square number.

16378896997225 is the 2023543-rd centered octagonal number.

It is an amenable number.

16378896997225 is a deficient number, since it is larger than the sum of its proper divisors (7247030585006).

16378896997225 is an frugal number, since it uses more digits than its factorization.

16378896997225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231286 (or 115643 counting only the distinct ones).

The product of its digits is 4938071040, while the sum is 82.

The spelling of 16378896997225 in words is "sixteen trillion, three hundred seventy-eight billion, eight hundred ninety-six million, nine hundred ninety-seven thousand, two hundred twenty-five".