1660090518025 has 9 divisors (see below), whose sum is σ = 2058520230741. Its totient is φ = 1328067260640.

The previous prime is 1660090518013. The next prime is 1660090518101. The reversal of 1660090518025 is 5208150900661.

The square root of 1660090518025 is 1288445.

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 35087658489 + 1625002859536 = 187317^2 + 1274756^2 .

It is not a de Polignac number, because 1660090518025 - 2⁹ = 1660090517513 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6313381 + ... + 6571069.

Almost surely, 2^{1660090518025} is an apocalyptic number.

1660090518025 is the 1288445-th square number.

1660090518025 is the 644223-rd centered octagonal number.

It is an amenable number.

1660090518025 is a deficient number, since it is larger than the sum of its proper divisors (398429712716).

1660090518025 is an frugal number, since it uses more digits than its factorization.

1660090518025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515388 (or 257694 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 43.

The spelling of 1660090518025 in words is "one trillion, six hundred sixty billion, ninety million, five hundred eighteen thousand, twenty-five".