1978549446956 has 12 divisors (see below), whose sum is σ = 3462591900768. Its totient is φ = 989237475312.

The previous prime is 1978549446953. The next prime is 1978549446959. The reversal of 1978549446956 is 6596449458791.

It is an interprime number because it is at equal distance from previous prime (1978549446953) and next prime (1978549446959).

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 3 ways as a sum of consecutive naturals, for example, 9192356 + ... + 9405131.

It is an arithmetic number, because the mean of its divisors is an integer number (288549325064).

Almost surely, 2^{1978549446956} is an apocalyptic number.

It is an amenable number.

1978549446956 is a deficient number, since it is larger than the sum of its proper divisors (1484042453812).

1978549446956 is a wasteful number, since it uses less digits than its factorization.

1978549446956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18624088 (or 18624086 counting only the distinct ones).

The product of its digits is 2351462400, while the sum is 77.

The spelling of 1978549446956 in words is "one trillion, nine hundred seventy-eight billion, five hundred forty-nine million, four hundred forty-six thousand, nine hundred fifty-six".