65172665 has 8 divisors (see below), whose sum is σ = 78330888. Its totient is φ = 52055680.

The previous prime is 65172661. The next prime is 65172683. The reversal of 65172665 is 56627156.

It can be written as a sum of positive squares in 4 ways, for example, as 11751184 + 53421481 = 3428^2 + 7309^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 65172665 - 2² = 65172661 is a prime.

It is a super-4 number, since 4×65172665⁴ (a number of 32 digits) contains 4444 as substring.

It is a Duffinian number.

It is a Curzon number.

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 7 ways as a sum of consecutive naturals, for example, 6716 + ... + 13245.

It is an arithmetic number, because the mean of its divisors is an integer number (9791361).

Almost surely, 2^65172665 is an apocalyptic number.

It is an amenable number.

65172665 is a deficient number, since it is larger than the sum of its proper divisors (13158223).

65172665 is a wasteful number, since it uses less digits than its factorization.

65172665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20619.

The product of its digits is 75600, while the sum is 38.

The square root of 65172665 is about 8072.9588751585. The cubic root of 65172665 is about 402.4282808831.

The spelling of 65172665 in words is "sixty-five million, one hundred seventy-two thousand, six hundred sixty-five".