65521917 has 12 divisors (see below), whose sum is σ = 98757984. Its totient is φ = 41781960.

The previous prime is 65521903. The next prime is 65521921. The reversal of 65521917 is 71912556.

It is not a de Polignac number, because 65521917 - 2⁷ = 65521789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65521517) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 158059 + ... + 158472.

It is an arithmetic number, because the mean of its divisors is an integer number (8229832).

Almost surely, 2^65521917 is an apocalyptic number.

It is an amenable number.

65521917 is a deficient number, since it is larger than the sum of its proper divisors (33236067).

65521917 is a wasteful number, since it uses less digits than its factorization.

65521917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316560 (or 316557 counting only the distinct ones).

The product of its digits is 18900, while the sum is 36.

The square root of 65521917 is about 8094.5609516514. The cubic root of 65521917 is about 403.1458545548.

The spelling of 65521917 in words is "sixty-five million, five hundred twenty-one thousand, nine hundred seventeen".