65412561 has 4 divisors (see below), whose sum is σ = 87216752. Its totient is φ = 43608372.

The previous prime is 65412541. The next prime is 65412563. The reversal of 65412561 is 16521456.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 65412561 - 2⁷ = 65412433 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65412563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10902091 + ... + 10902096.

It is an arithmetic number, because the mean of its divisors is an integer number (21804188).

Almost surely, 2^65412561 is an apocalyptic number.

It is an amenable number.

65412561 is a deficient number, since it is larger than the sum of its proper divisors (21804191).

65412561 is a wasteful number, since it uses less digits than its factorization.

65412561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21804190.

The product of its digits is 7200, while the sum is 30.

The square root of 65412561 is about 8087.8032246093. The cubic root of 65412561 is about 402.9214463487.

The spelling of 65412561 in words is "sixty-five million, four hundred twelve thousand, five hundred sixty-one".