1816928764225 has 27 divisors (see below), whose sum is σ = 2285772872521. Its totient is φ = 1432693152800.

The previous prime is 1816928764171. The next prime is 1816928764253. The reversal of 1816928764225 is 5224678296181.

The square root of 1816928764225 is 1347935.

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

It can be written as a sum of positive squares in 4 ways, for example, as 957644259649 + 859284504576 = 978593^2 + 926976^2 .

It is not a de Polignac number, because 1816928764225 - 2³⁷ = 1679489810753 is a prime.

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, 478515027 + ... + 478518823.

Almost surely, 2^{1816928764225} is an apocalyptic number.

1816928764225 is the 1347935-th square number.

1816928764225 is the 673968-th centered octagonal number.

It is an amenable number.

1816928764225 is a deficient number, since it is larger than the sum of its proper divisors (468844108296).

1816928764225 is an frugal number, since it uses more digits than its factorization.

1816928764225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7746 (or 3873 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 61.

The spelling of 1816928764225 in words is "one trillion, eight hundred sixteen billion, nine hundred twenty-eight million, seven hundred sixty-four thousand, two hundred twenty-five".