1978506960172 has 12 divisors (see below), whose sum is σ = 3468167463600. Its totient is φ = 987601970576.

The previous prime is 1978506960163. The next prime is 1978506960203. The reversal of 1978506960172 is 2710696058791.

It is a self number, because there is not a number n which added to its sum of digits gives 1978506960172.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 412874683 + ... + 412879474.

It is an arithmetic number, because the mean of its divisors is an integer number (289013955300).

Almost surely, 2^{1978506960172} is an apocalyptic number.

It is an amenable number.

1978506960172 is a deficient number, since it is larger than the sum of its proper divisors (1489660503428).

1978506960172 is a wasteful number, since it uses less digits than its factorization.

1978506960172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825754760 (or 825754758 counting only the distinct ones).

The product of its (nonzero) digits is 11430720, while the sum is 61.

The spelling of 1978506960172 in words is "one trillion, nine hundred seventy-eight billion, five hundred six million, nine hundred sixty thousand, one hundred seventy-two".