66562525 has 6 divisors (see below), whose sum is σ = 82537562. Its totient is φ = 53250000.

The previous prime is 66562523. The next prime is 66562543. The reversal of 66562525 is 52526566.

It can be written as a sum of positive squares in 3 ways, for example, as 205209 + 66357316 = 453^2 + 8146^2 .

It is not a de Polignac number, because 66562525 - 2¹ = 66562523 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66562523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1331226 + ... + 1331275.

Almost surely, 2^66562525 is an apocalyptic number.

It is an amenable number.

66562525 is a deficient number, since it is larger than the sum of its proper divisors (15975037).

66562525 is a wasteful number, since it uses less digits than its factorization.

66562525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2662511 (or 2662506 counting only the distinct ones).

The product of its digits is 108000, while the sum is 37.

The square root of 66562525 is about 8158.5859681687. The cubic root of 66562525 is about 405.2688861177.

It can be divided in two parts, 665 and 62525, that added together give a triangular number (63190 = T₃₅₅).

The spelling of 66562525 in words is "sixty-six million, five hundred sixty-two thousand, five hundred twenty-five".