1968649866459 has 80 divisors (see below), whose sum is σ = 3010074024672. Its totient is φ = 1281769961472.

The previous prime is 1968649866383. The next prime is 1968649866479. The reversal of 1968649866459 is 9546689468691.

1968649866459 is a `hidden beast` number, since 1 + 9 + 6 + 86 + 4 + 9 + 86 + 6 + 459 = 666.

It is not a de Polignac number, because 1968649866459 - 2¹¹ = 1968649864411 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is not an unprimeable number, because it can be changed into a prime (1968649866479) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1692733612 + ... + 1692734774.

Almost surely, 2^{1968649866459} is an apocalyptic number.

1968649866459 is a deficient number, since it is larger than the sum of its proper divisors (1041424158213).

1968649866459 is a wasteful number, since it uses less digits than its factorization.

1968649866459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2698 (or 2689 counting only the distinct ones).

The product of its digits is 4837294080, while the sum is 81.

The spelling of 1968649866459 in words is "one trillion, nine hundred sixty-eight billion, six hundred forty-nine million, eight hundred sixty-six thousand, four hundred fifty-nine".