16151436643225 has 81 divisors (see below), whose sum is σ = 23043963976677. Its totient is φ = 11222527380480.

The previous prime is 16151436643201. The next prime is 16151436643247. The reversal of 16151436643225 is 52234663415161.

It is a happy number.

The square root of 16151436643225 is 4018885.

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

It can be written as a sum of positive squares in 40 ways, for example, as 6905190939529 + 9246245703696 = 2627773^2 + 3040764^2 .

It is not a de Polignac number, because 16151436643225 - 2⁹ = 16151436642713 is a prime.

It is a super-2 number, since 2×16151436643225² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 4440866107 + ... + 4440869743.

Almost surely, 2^{16151436643225} is an apocalyptic number.

16151436643225 is the 4018885-th square number.

16151436643225 is the 2009443-rd centered octagonal number.

It is an amenable number.

16151436643225 is a deficient number, since it is larger than the sum of its proper divisors (6892527333452).

16151436643225 is an frugal number, since it uses more digits than its factorization.

16151436643225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7344 (or 3672 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 49.

Multiplying 16151436643225 by its sum of digits (49), we get a square (791420395518025 = 28132195²).

The spelling of 16151436643225 in words is "sixteen trillion, one hundred fifty-one billion, four hundred thirty-six million, six hundred forty-three thousand, two hundred twenty-five".