6660660018025 has 48 divisors (see below), whose sum is σ = 9161116342000. Its totient is φ = 4771989365760.

The previous prime is 6660660018017. The next prime is 6660660018083. The reversal of 6660660018025 is 5208100660666.

It can be written as a sum of positive squares in 24 ways, for example, as 4843591065856 + 1817068952169 = 2200816^2 + 1347987^2 .

It is not a de Polignac number, because 6660660018025 - 2³ = 6660660018017 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3403171 + ... + 4990279.

Almost surely, 2^{6660660018025} is an apocalyptic number.

6660660018025 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6660660018025 is a deficient number, since it is larger than the sum of its proper divisors (2500456323975).

6660660018025 is a wasteful number, since it uses less digits than its factorization.

6660660018025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1587518 (or 1587513 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 46.

The spelling of 6660660018025 in words is "six trillion, six hundred sixty billion, six hundred sixty million, eighteen thousand, twenty-five".