1968394655 has 4 divisors (see below), whose sum is σ = 2362073592. Its totient is φ = 1574715720.

The previous prime is 1968394651. The next prime is 1968394697. The reversal of 1968394655 is 5564938691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5564938691 = 13 ⋅428072207.

It is not a de Polignac number, because 1968394655 - 2² = 1968394651 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 1968394655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1968394651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196839461 + ... + 196839470.

It is an arithmetic number, because the mean of its divisors is an integer number (590518398).

Almost surely, 2^1968394655 is an apocalyptic number.

1968394655 is a deficient number, since it is larger than the sum of its proper divisors (393678937).

1968394655 is an equidigital number, since it uses as much as digits as its factorization.

1968394655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393678936.

The product of its digits is 6998400, while the sum is 56.

The square root of 1968394655 is about 44366.5939080295. The cubic root of 1968394655 is about 1253.2490738980.

The spelling of 1968394655 in words is "one billion, nine hundred sixty-eight million, three hundred ninety-four thousand, six hundred fifty-five".