65516251 has 2 divisors, whose sum is σ = 65516252. Its totient is φ = 65516250.

The previous prime is 65516203. The next prime is 65516263. The reversal of 65516251 is 15261556.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65516251 - 2¹¹ = 65514203 is a prime.

It is not a weakly prime, because it can be changed into another prime (65516281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32758125 + 32758126.

It is an arithmetic number, because the mean of its divisors is an integer number (32758126).

Almost surely, 2^65516251 is an apocalyptic number.

65516251 is a deficient number, since it is larger than the sum of its proper divisors (1).

65516251 is an equidigital number, since it uses as much as digits as its factorization.

65516251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9000, while the sum is 31.

The square root of 65516251 is about 8094.2109559858. The cubic root of 65516251 is about 403.1342335565.

The spelling of 65516251 in words is "sixty-five million, five hundred sixteen thousand, two hundred fifty-one".