1660155025 has 27 divisors (see below), whose sum is σ = 2139640243. Its totient is φ = 1277763200.

The previous prime is 1660155017. The next prime is 1660155031. The reversal of 1660155025 is 5205510661.

The square root of 1660155025 is 40745.

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

It can be written as a sum of positive squares in 13 ways, for example, as 727219089 + 932935936 = 26967^2 + 30544^2 .

It is not a de Polignac number, because 1660155025 - 2³ = 1660155017 is a prime.

It is a super-2 number, since 2×1660155025² = 5512229414065501250, which 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 (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 5907885 + ... + 5908165.

Almost surely, 2^1660155025 is an apocalyptic number.

1660155025 is the 40745-th square number.

1660155025 is the 20373-rd centered octagonal number.

It is an amenable number.

1660155025 is a deficient number, since it is larger than the sum of its proper divisors (479485218).

1660155025 is an frugal number, since it uses more digits than its factorization.

1660155025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630 (or 315 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 31.

The cubic root of 1660155025 is about 1184.0850052438.

Adding to 1660155025 its reverse (5205510661), we get a palindrome (6865665686).

The spelling of 1660155025 in words is "one billion, six hundred sixty million, one hundred fifty-five thousand, twenty-five".