1966938639631 has 8 divisors (see below), whose sum is σ = 2256224820224. Its totient is φ = 1679726195640.

The previous prime is 1966938639613. The next prime is 1966938639637. The reversal of 1966938639631 is 1369368396691.

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

It is a cyclic number.

It is not a de Polignac number, because 1966938639631 - 2¹³ = 1966938631439 is a prime.

It is a super-2 number, since 2×1966938639631² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1966938639637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 518432115 + ... + 518435908.

It is an arithmetic number, because the mean of its divisors is an integer number (282028102528).

Almost surely, 2^{1966938639631} is an apocalyptic number.

1966938639631 is a deficient number, since it is larger than the sum of its proper divisors (289286180593).

1966938639631 is a wasteful number, since it uses less digits than its factorization.

1966938639631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1036868301.

The product of its digits is 204073344, while the sum is 70.

The spelling of 1966938639631 in words is "one trillion, nine hundred sixty-six billion, nine hundred thirty-eight million, six hundred thirty-nine thousand, six hundred thirty-one".