65995961 has 4 divisors (see below), whose sum is σ = 67077924. Its totient is φ = 64914000.

The previous prime is 65995939. The next prime is 65995981. The reversal of 65995961 is 16959956.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16152361 + 49843600 = 4019^2 + 7060^2 .

It is a cyclic number.

It is not a de Polignac number, because 65995961 - 2¹⁴ = 65979577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65995981) 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, 540890 + ... + 541011.

It is an arithmetic number, because the mean of its divisors is an integer number (16769481).

Almost surely, 2^65995961 is an apocalyptic number.

65995961 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

65995961 is a deficient number, since it is larger than the sum of its proper divisors (1081963).

65995961 is a wasteful number, since it uses less digits than its factorization.

65995961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081962.

The product of its digits is 656100, while the sum is 50.

The square root of 65995961 is about 8123.7898175667. The cubic root of 65995961 is about 404.1157581726.

The spelling of 65995961 in words is "sixty-five million, nine hundred ninety-five thousand, nine hundred sixty-one".