66172325 has 6 divisors (see below), whose sum is σ = 82053714. Its totient is φ = 52937840.

The previous prime is 66172291. The next prime is 66172361. The reversal of 66172325 is 52327166.

It can be written as a sum of positive squares in 3 ways, for example, as 13667809 + 52504516 = 3697^2 + 7246^2 .

It is not a de Polignac number, because 66172325 - 2⁶ = 66172261 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66172291 and 66172300.

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, 1323422 + ... + 1323471.

It is an arithmetic number, because the mean of its divisors is an integer number (13675619).

Almost surely, 2^66172325 is an apocalyptic number.

It is an amenable number.

66172325 is a deficient number, since it is larger than the sum of its proper divisors (15881389).

66172325 is a wasteful number, since it uses less digits than its factorization.

66172325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2646903 (or 2646898 counting only the distinct ones).

The product of its digits is 15120, while the sum is 32.

The square root of 66172325 is about 8134.6373613087. The cubic root of 66172325 is about 404.4754169419.

The spelling of 66172325 in words is "sixty-six million, one hundred seventy-two thousand, three hundred twenty-five".