1866672025 has 9 divisors (see below), whose sum is σ = 2314941213. Its totient is φ = 1493164800.

The previous prime is 1866672023. The next prime is 1866672047. The reversal of 1866672025 is 5202766681.

The square root of 1866672025 is 43205.

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 885479049 + 981192976 = 29757^2 + 31324^2 .

It is not a de Polignac number, because 1866672025 - 2¹ = 1866672023 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1866672023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 211705 + ... + 220345.

Almost surely, 2^1866672025 is an apocalyptic number.

1866672025 is the 43205-th square number.

1866672025 is the 21603-rd centered octagonal number.

It is an amenable number.

1866672025 is a deficient number, since it is larger than the sum of its proper divisors (448269188).

1866672025 is an frugal number, since it uses more digits than its factorization.

1866672025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17292 (or 8646 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The cubic root of 1866672025 is about 1231.2776784385.

The spelling of 1866672025 in words is "one billion, eight hundred sixty-six million, six hundred seventy-two thousand, twenty-five".