1978549446954 has 32 divisors (see below), whose sum is σ = 4129422125184. Its totient is φ = 630799769600.

The previous prime is 1978549446953. The next prime is 1978549446959. The reversal of 1978549446954 is 4596449458791.

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 15 ways as a sum of consecutive naturals, for example, 1631554 + ... + 2572754.

It is an arithmetic number, because the mean of its divisors is an integer number (129044441412).

Almost surely, 2^{1978549446954} is an apocalyptic number.

1978549446954 is an abundant number, since it is smaller than the sum of its proper divisors (2150872678230).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1978549446954 is a wasteful number, since it uses less digits than its factorization.

1978549446954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 956462.

The product of its digits is 1567641600, while the sum is 75.

It can be divided in two parts, 1978549 and 446954, that added together give a triangular number (2425503 = T₂₂₀₂).

The spelling of 1978549446954 in words is "one trillion, nine hundred seventy-eight billion, five hundred forty-nine million, four hundred forty-six thousand, nine hundred fifty-four".