1968411378461 has 16 divisors (see below), whose sum is σ = 2220290751168. Its totient is φ = 1729503292800.

The previous prime is 1968411378457. The next prime is 1968411378481. The reversal of 1968411378461 is 1648731148691.

It is a cyclic number.

It is not a de Polignac number, because 1968411378461 - 2² = 1968411378457 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1968411378461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1968411378431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20346830 + ... + 20443343.

It is an arithmetic number, because the mean of its divisors is an integer number (138768171948).

Almost surely, 2^{1968411378461} is an apocalyptic number.

1968411378461 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1968411378461 is a deficient number, since it is larger than the sum of its proper divisors (251879372707).

1968411378461 is a wasteful number, since it uses less digits than its factorization.

1968411378461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40790332.

The product of its digits is 6967296, while the sum is 59.

The spelling of 1968411378461 in words is "one trillion, nine hundred sixty-eight billion, four hundred eleven million, three hundred seventy-eight thousand, four hundred sixty-one".