65865961 has 4 divisors (see below), whose sum is σ = 75275392. Its totient is φ = 56456532.

The previous prime is 65865953. The next prime is 65865977. The reversal of 65865961 is 16956856.

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 a cyclic number.

It is not a de Polignac number, because 65865961 - 2³ = 65865953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65865991) 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, 4704705 + ... + 4704718.

It is an arithmetic number, because the mean of its divisors is an integer number (18818848).

Almost surely, 2^65865961 is an apocalyptic number.

It is an amenable number.

65865961 is a deficient number, since it is larger than the sum of its proper divisors (9409431).

65865961 is an equidigital number, since it uses as much as digits as its factorization.

65865961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9409430.

The product of its digits is 388800, while the sum is 46.

The square root of 65865961 is about 8115.7846817175. The cubic root of 65865961 is about 403.8502389884.

The spelling of 65865961 in words is "sixty-five million, eight hundred sixty-five thousand, nine hundred sixty-one".