1968451654991 has 8 divisors (see below), whose sum is σ = 2086619504400. Its totient is φ = 1850547869568.

The previous prime is 1968451654951. The next prime is 1968451654999. The reversal of 1968451654991 is 1994561548691.

It is a happy number.

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 1968451654991 - 2¹⁴ = 1968451638607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1968451654999) 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, 66000641 + ... + 66030458.

It is an arithmetic number, because the mean of its divisors is an integer number (260827438050).

Almost surely, 2^{1968451654991} is an apocalyptic number.

1968451654991 is a deficient number, since it is larger than the sum of its proper divisors (118167849409).

1968451654991 is a wasteful number, since it uses less digits than its factorization.

1968451654991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132031993.

The product of its digits is 83980800, while the sum is 68.

The spelling of 1968451654991 in words is "one trillion, nine hundred sixty-eight billion, four hundred fifty-one million, six hundred fifty-four thousand, nine hundred ninety-one".