16158578225 has 12 divisors (see below), whose sum is σ = 20365108380. Its totient is φ = 12714945600.

The previous prime is 16158578221. The next prime is 16158578279. The reversal of 16158578225 is 52287585161.

It can be written as a sum of positive squares in 6 ways, for example, as 8685494416 + 7473083809 = 93196^2 + 86447^2 .

It is not a de Polignac number, because 16158578225 - 2² = 16158578221 is a prime.

It is a super-2 number, since 2×16158578225² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16158578221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5296370 + ... + 5299419.

It is an arithmetic number, because the mean of its divisors is an integer number (1697092365).

Almost surely, 2^16158578225 is an apocalyptic number.

It is an amenable number.

16158578225 is a deficient number, since it is larger than the sum of its proper divisors (4206530155).

16158578225 is a wasteful number, since it uses less digits than its factorization.

16158578225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10595860 (or 10595855 counting only the distinct ones).

The product of its digits is 1344000, while the sum is 50.

The spelling of 16158578225 in words is "sixteen billion, one hundred fifty-eight million, five hundred seventy-eight thousand, two hundred twenty-five".