1978614783321 has 16 divisors (see below), whose sum is σ = 2878092103680. Its totient is φ = 1199115906320.

The previous prime is 1978614783319. The next prime is 1978614783349. The reversal of 1978614783321 is 1233874168791.

It is a cyclic number.

It is not a de Polignac number, because 1978614783321 - 2¹ = 1978614783319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1978614783371) 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, 201705 + ... + 1999478.

It is an arithmetic number, because the mean of its divisors is an integer number (179880756480).

Almost surely, 2^{1978614783321} is an apocalyptic number.

1978614783321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1978614783321 is a deficient number, since it is larger than the sum of its proper divisors (899477320359).

1978614783321 is a wasteful number, since it uses less digits than its factorization.

1978614783321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2228436.

The product of its digits is 12192768, while the sum is 60.

The spelling of 1978614783321 in words is "one trillion, nine hundred seventy-eight billion, six hundred fourteen million, seven hundred eighty-three thousand, three hundred twenty-one".