65642501 has 2 divisors, whose sum is σ = 65642502. Its totient is φ = 65642500.

The previous prime is 65642471. The next prime is 65642509. The reversal of 65642501 is 10524656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36590401 + 29052100 = 6049^2 + 5390^2 .

It is a cyclic number.

It is not a de Polignac number, because 65642501 - 2²² = 61448197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65642509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32821250 + 32821251.

It is an arithmetic number, because the mean of its divisors is an integer number (32821251).

Almost surely, 2^65642501 is an apocalyptic number.

It is an amenable number.

65642501 is a deficient number, since it is larger than the sum of its proper divisors (1).

65642501 is an equidigital number, since it uses as much as digits as its factorization.

65642501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 65642501 is about 8102.0059861740. The cubic root of 65642501 is about 403.3930143379.

The spelling of 65642501 in words is "sixty-five million, six hundred forty-two thousand, five hundred one".