1978649877194 has 8 divisors (see below), whose sum is σ = 2967981747168. Its totient is φ = 989322628140.

The previous prime is 1978649877187. The next prime is 1978649877209. The reversal of 1978649877194 is 4917789468791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263939 + ... + 2006729.

It is an arithmetic number, because the mean of its divisors is an integer number (370997718396).

Almost surely, 2^{1978649877194} is an apocalyptic number.

1978649877194 is a deficient number, since it is larger than the sum of its proper divisors (989331869974).

1978649877194 is a wasteful number, since it uses less digits than its factorization.

1978649877194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2310460.

The product of its digits is 1536288768, while the sum is 80.

The spelling of 1978649877194 in words is "one trillion, nine hundred seventy-eight billion, six hundred forty-nine million, eight hundred seventy-seven thousand, one hundred ninety-four".