66316961 has 4 divisors (see below), whose sum is σ = 66581424. Its totient is φ = 66052500.

The previous prime is 66316937. The next prime is 66316963. The reversal of 66316961 is 16961366.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16961366 = 2 ⋅8480683.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66316961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66316963) 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, 131855 + ... + 132356.

It is an arithmetic number, because the mean of its divisors is an integer number (16645356).

Almost surely, 2^66316961 is an apocalyptic number.

It is an amenable number.

66316961 is a deficient number, since it is larger than the sum of its proper divisors (264463).

66316961 is a wasteful number, since it uses less digits than its factorization.

66316961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264462.

The product of its digits is 34992, while the sum is 38.

The square root of 66316961 is about 8143.5226407250. The cubic root of 66316961 is about 404.7698962164.

The spelling of 66316961 in words is "sixty-six million, three hundred sixteen thousand, nine hundred sixty-one".