65455581 has 16 divisors (see below), whose sum is σ = 90596160. Its totient is φ = 41986560.

The previous prime is 65455567. The next prime is 65455597. The reversal of 65455581 is 18555456.

It is not a de Polignac number, because 65455581 - 2¹⁴ = 65439197 is a prime.

It is a super-2 number, since 2×65455581² = 8568866168095122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65455531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27661 + ... + 29933.

It is an arithmetic number, because the mean of its divisors is an integer number (5662260).

Almost surely, 2^65455581 is an apocalyptic number.

It is an amenable number.

65455581 is a deficient number, since it is larger than the sum of its proper divisors (25140579).

65455581 is a wasteful number, since it uses less digits than its factorization.

65455581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2636.

The product of its digits is 120000, while the sum is 39.

The square root of 65455581 is about 8090.4623477277. The cubic root of 65455581 is about 403.0097570227.

The spelling of 65455581 in words is "sixty-five million, four hundred fifty-five thousand, five hundred eighty-one".