1978266106444 has 12 divisors (see below), whose sum is σ = 3581343813600. Its totient is φ = 955025016848.

The previous prime is 1978266106409. The next prime is 1978266106513. The reversal of 1978266106444 is 4446016628791.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (58).

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, 8527008964 + ... + 8527009195.

It is an arithmetic number, because the mean of its divisors is an integer number (298445317800).

Almost surely, 2^{1978266106444} is an apocalyptic number.

It is an amenable number.

1978266106444 is a deficient number, since it is larger than the sum of its proper divisors (1603077707156).

1978266106444 is a wasteful number, since it uses less digits than its factorization.

1978266106444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17054018192 (or 17054018190 counting only the distinct ones).

The product of its (nonzero) digits is 13934592, while the sum is 58.

The spelling of 1978266106444 in words is "one trillion, nine hundred seventy-eight billion, two hundred sixty-six million, one hundred six thousand, four hundred forty-four".