966661313971 has 4 divisors (see below), whose sum is σ = 968164675912. Its totient is φ = 965157952032.

The previous prime is 966661313887. The next prime is 966661313993. The reversal of 966661313971 is 179313166669.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 966661313971 - 2⁷ = 966661313843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (966661313771) 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, 751680006 + ... + 751681291.

It is an arithmetic number, because the mean of its divisors is an integer number (242041168978).

Almost surely, 2^966661313971 is an apocalyptic number.

966661313971 is a deficient number, since it is larger than the sum of its proper divisors (1503361941).

966661313971 is a wasteful number, since it uses less digits than its factorization.

966661313971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1503361940.

The product of its digits is 6613488, while the sum is 58.

The spelling of 966661313971 in words is "nine hundred sixty-six billion, six hundred sixty-one million, three hundred thirteen thousand, nine hundred seventy-one".