1978549446955 has 8 divisors (see below), whose sum is σ = 2376492888672. Its totient is φ = 1581350522688.

The previous prime is 1978549446953. The next prime is 1978549446959. The reversal of 1978549446955 is 5596449458791.

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 1978549446955 - 2¹ = 1978549446953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1978549446953) 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, 186123514 + ... + 186134143.

It is an arithmetic number, because the mean of its divisors is an integer number (297061611084).

Almost surely, 2^{1978549446955} is an apocalyptic number.

1978549446955 is a deficient number, since it is larger than the sum of its proper divisors (397943441717).

1978549446955 is a wasteful number, since it uses less digits than its factorization.

1978549446955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372258725.

The product of its digits is 1959552000, while the sum is 76.

The spelling of 1978549446955 in words is "one trillion, nine hundred seventy-eight billion, five hundred forty-nine million, four hundred forty-six thousand, nine hundred fifty-five".