66822525 has 216 divisors, whose sum is σ = 165391200. Its totient is φ = 25401600.

The previous prime is 66822523. The next prime is 66822527. The reversal of 66822525 is 52522866.

It is an interprime number because it is at equal distance from previous prime (66822523) and next prime (66822527).

It is not a de Polignac number, because 66822525 - 2¹ = 66822523 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66822525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66822523) by changing a digit.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 2304211 + ... + 2304239.

It is an arithmetic number, because the mean of its divisors is an integer number (765700).

Almost surely, 2^66822525 is an apocalyptic number.

It is an amenable number.

66822525 is an abundant number, since it is smaller than the sum of its proper divisors (98568675).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66822525 is a wasteful number, since it uses less digits than its factorization.

66822525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89 (or 74 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 66822525 is about 8174.5045721438. The cubic root of 66822525 is about 405.7958744000.

The spelling of 66822525 in words is "sixty-six million, eight hundred twenty-two thousand, five hundred twenty-five".