66894525 has 24 divisors (see below), whose sum is σ = 122888960. Its totient is φ = 35676720.

The previous prime is 66894521. The next prime is 66894547. The reversal of 66894525 is 52549866.

It is not a de Polignac number, because 66894525 - 2² = 66894521 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66894521) 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 23 ways as a sum of consecutive naturals, for example, 48877 + ... + 50226.

Almost surely, 2^66894525 is an apocalyptic number.

It is an amenable number.

66894525 is a deficient number, since it is larger than the sum of its proper divisors (55994435).

66894525 is a wasteful number, since it uses less digits than its factorization.

66894525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99122 (or 99111 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The square root of 66894525 is about 8178.9073231086. The cubic root of 66894525 is about 405.9415678646.

The spelling of 66894525 in words is "sixty-six million, eight hundred ninety-four thousand, five hundred twenty-five".