65172761 has 2 divisors, whose sum is σ = 65172762. Its totient is φ = 65172760.

The previous prime is 65172743. The next prime is 65172763. The reversal of 65172761 is 16727156.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36228361 + 28944400 = 6019^2 + 5380^2 .

It is a cyclic number.

It is not a de Polignac number, because 65172761 - 2⁶ = 65172697 is a prime.

Together with 65172763, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (65172763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32586380 + 32586381.

It is an arithmetic number, because the mean of its divisors is an integer number (32586381).

Almost surely, 2^65172761 is an apocalyptic number.

It is an amenable number.

65172761 is a deficient number, since it is larger than the sum of its proper divisors (1).

65172761 is an equidigital number, since it uses as much as digits as its factorization.

65172761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17640, while the sum is 35.

The square root of 65172761 is about 8072.9648209317. The cubic root of 65172761 is about 402.4284784766.

The spelling of 65172761 in words is "sixty-five million, one hundred seventy-two thousand, seven hundred sixty-one".