65172666 has 32 divisors (see below), whose sum is σ = 140995008. Its totient is φ = 19964160.

The previous prime is 65172661. The next prime is 65172683. The reversal of 65172666 is 66627156.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (65172661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17065 + ... + 20531.

It is an arithmetic number, because the mean of its divisors is an integer number (4406094).

Almost surely, 2^65172666 is an apocalyptic number.

65172666 is an abundant number, since it is smaller than the sum of its proper divisors (75822342).

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

65172666 is a wasteful number, since it uses less digits than its factorization.

65172666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3726.

The product of its digits is 90720, while the sum is 39.

The square root of 65172666 is about 8072.9589370936. The cubic root of 65172666 is about 402.4282829413.

The spelling of 65172666 in words is "sixty-five million, one hundred seventy-two thousand, six hundred sixty-six".