66432725 has 6 divisors (see below), whose sum is σ = 82376610. Its totient is φ = 53146160.

The previous prime is 66432713. The next prime is 66432731. The reversal of 66432725 is 52723466.

It can be written as a sum of positive squares in 3 ways, for example, as 790321 + 65642404 = 889^2 + 8102^2 .

It is not a de Polignac number, because 66432725 - 2⁸ = 66432469 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1328630 + ... + 1328679.

It is an arithmetic number, because the mean of its divisors is an integer number (13729435).

Almost surely, 2^66432725 is an apocalyptic number.

It is an amenable number.

66432725 is a deficient number, since it is larger than the sum of its proper divisors (15943885).

66432725 is a wasteful number, since it uses less digits than its factorization.

66432725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2657319 (or 2657314 counting only the distinct ones).

The product of its digits is 60480, while the sum is 35.

The square root of 66432725 is about 8150.6272764739. The cubic root of 66432725 is about 405.0052836785.

The spelling of 66432725 in words is "sixty-six million, four hundred thirty-two thousand, seven hundred twenty-five".