6659376025 has 27 divisors (see below), whose sum is σ = 8725269951. Its totient is φ = 5041230480.

The previous prime is 6659375993. The next prime is 6659376089. The reversal of 6659376025 is 5206739566.

It is a happy number.

The square root of 6659376025 is 81605.

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

It can be written as a sum of positive squares in only one way, i.e., 2397375369 + 4262000656 = 48963^2 + 65284^2 .

It is not a de Polignac number, because 6659376025 - 2⁵ = 6659375993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6659376025.

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, 7752046 + ... + 7752904.

Almost surely, 2^6659376025 is an apocalyptic number.

6659376025 is the 81605-th square number.

6659376025 is the 40803-rd centered octagonal number.

It is an amenable number.

6659376025 is a deficient number, since it is larger than the sum of its proper divisors (2065893926).

6659376025 is an frugal number, since it uses more digits than its factorization.

6659376025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1766 (or 883 counting only the distinct ones).

The product of its (nonzero) digits is 2041200, while the sum is 49.

The cubic root of 6659376025 is about 1881.3857318652.

Multiplying 6659376025 by its sum of digits (49), we get a square (326309425225 = 571235²).

The spelling of 6659376025 in words is "six billion, six hundred fifty-nine million, three hundred seventy-six thousand, twenty-five".