65621017 has 32 divisors (see below), whose sum is σ = 86851584. Its totient is φ = 48081600.

The previous prime is 65621011. The next prime is 65621057. The reversal of 65621017 is 71012656.

65621017 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 65621017 - 2³ = 65621009 is a prime.

It is a super-2 number, since 2×65621017² = 8612235744228578, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65621011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87948 + ... + 88690.

It is an arithmetic number, because the mean of its divisors is an integer number (2714112).

Almost surely, 2^65621017 is an apocalyptic number.

It is an amenable number.

65621017 is a deficient number, since it is larger than the sum of its proper divisors (21230567).

65621017 is a wasteful number, since it uses less digits than its factorization.

65621017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 829.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 65621017 is about 8100.6800331824. The cubic root of 65621017 is about 403.3490009775.

The spelling of 65621017 in words is "sixty-five million, six hundred twenty-one thousand, seventeen".