1978017523342 has 48 divisors (see below), whose sum is σ = 3607874334720. Its totient is φ = 809991327600.

The previous prime is 1978017523319. The next prime is 1978017523381. The reversal of 1978017523342 is 2433257108791.

It is a self number, because there is not a number n which added to its sum of digits gives 1978017523342.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3880834 + ... + 4360837.

It is an arithmetic number, because the mean of its divisors is an integer number (75164048640).

Almost surely, 2^{1978017523342} is an apocalyptic number.

1978017523342 is a deficient number, since it is larger than the sum of its proper divisors (1629856811378).

1978017523342 is a wasteful number, since it uses less digits than its factorization.

1978017523342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8241797 (or 8241790 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 52.

The spelling of 1978017523342 in words is "one trillion, nine hundred seventy-eight billion, seventeen million, five hundred twenty-three thousand, three hundred forty-two".