1966845631616 has 16 divisors (see below), whose sum is σ = 3918325281990. Its totient is φ = 983422815744.

The previous prime is 1966845631607. The next prime is 1966845631657. The reversal of 1966845631616 is 6161365486691.

It can be written as a sum of positive squares in only one way, i.e., 1399716145216 + 567129486400 = 1183096^2 + 753080^2 .

It is a tau number, because it is divible by the number of its divisors (16).

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 as a sum of consecutive naturals, namely, 7682990621 + ... + 7682990876.

Almost surely, 2^{1966845631616} is an apocalyptic number.

1966845631616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1966845631616 is a deficient number, since it is larger than the sum of its proper divisors (1951479650374).

1966845631616 is an equidigital number, since it uses as much as digits as its factorization.

1966845631616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15365981511 (or 15365981499 counting only the distinct ones).

The product of its digits is 33592320, while the sum is 62.

The spelling of 1966845631616 in words is "one trillion, nine hundred sixty-six billion, eight hundred forty-five million, six hundred thirty-one thousand, six hundred sixteen".