1971658613966 has 8 divisors (see below), whose sum is σ = 2958266833560. Its totient is φ = 985569669448.

The previous prime is 1971658613959. The next prime is 1971658613983. The reversal of 1971658613966 is 6693168561791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1971658613896 and 1971658613905.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129809276 + ... + 129824463.

It is an arithmetic number, because the mean of its divisors is an integer number (369783354195).

Almost surely, 2^{1971658613966} is an apocalyptic number.

1971658613966 is a deficient number, since it is larger than the sum of its proper divisors (986608219594).

1971658613966 is a wasteful number, since it uses less digits than its factorization.

1971658613966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259637538.

The product of its digits is 88179840, while the sum is 68.

The spelling of 1971658613966 in words is "one trillion, nine hundred seventy-one billion, six hundred fifty-eight million, six hundred thirteen thousand, nine hundred sixty-six".