65515651 has 2 divisors, whose sum is σ = 65515652. Its totient is φ = 65515650.

The previous prime is 65515633. The next prime is 65515673. The reversal of 65515651 is 15651556.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65515651 - 2¹¹ = 65513603 is a prime.

It is not a weakly prime, because it can be changed into another prime (65515631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32757825 + 32757826.

It is an arithmetic number, because the mean of its divisors is an integer number (32757826).

Almost surely, 2^65515651 is an apocalyptic number.

65515651 is a deficient number, since it is larger than the sum of its proper divisors (1).

65515651 is an equidigital number, since it uses as much as digits as its factorization.

65515651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22500, while the sum is 34.

The square root of 65515651 is about 8094.1738923747. The cubic root of 65515651 is about 403.1330029139.

It can be divided in two parts, 65515 and 651, that added together give a palindrome (66166).

The spelling of 65515651 in words is "sixty-five million, five hundred fifteen thousand, six hundred fifty-one".