66662525 has 24 divisors (see below), whose sum is σ = 88447464. Its totient is φ = 49664000.

The previous prime is 66662509. The next prime is 66662549. The reversal of 66662525 is 52526666.

66662525 = 471² + 472² + ... + 672².

It can be written as a sum of positive squares in 12 ways, for example, as 6770404 + 59892121 = 2602^2 + 7739^2 .

It is not a de Polignac number, because 66662525 - 2⁴ = 66662509 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42149 + ... + 43701.

It is an arithmetic number, because the mean of its divisors is an integer number (3685311).

Almost surely, 2^66662525 is an apocalyptic number.

It is an amenable number.

66662525 is a deficient number, since it is larger than the sum of its proper divisors (21784939).

66662525 is a wasteful number, since it uses less digits than its factorization.

66662525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1681 (or 1676 counting only the distinct ones).

The product of its digits is 129600, while the sum is 38.

The square root of 66662525 is about 8164.7121810876. The cubic root of 66662525 is about 405.4717360466.

The spelling of 66662525 in words is "sixty-six million, six hundred sixty-two thousand, five hundred twenty-five".