65609481 has 12 divisors (see below), whose sum is σ = 101761872. Its totient is φ = 37491048.

The previous prime is 65609449. The next prime is 65609483. The reversal of 65609481 is 18490656.

It is not a de Polignac number, because 65609481 - 2⁵ = 65609449 is a prime.

It is a super-2 number, since 2×65609481² = 8609207994178722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (65609483) 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, 223015 + ... + 223308.

It is an arithmetic number, because the mean of its divisors is an integer number (8480156).

Almost surely, 2^65609481 is an apocalyptic number.

It is an amenable number.

65609481 is a deficient number, since it is larger than the sum of its proper divisors (36152391).

65609481 is a wasteful number, since it uses less digits than its factorization.

65609481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446340 (or 446333 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 65609481 is about 8099.9679628996. The cubic root of 65609481 is about 403.3253636990.

The spelling of 65609481 in words is "sixty-five million, six hundred nine thousand, four hundred eighty-one".