19781220124562 has 32 divisors (see below), whose sum is σ = 34493374298880. Its totient is φ = 8431713702720.

The previous prime is 19781220124543. The next prime is 19781220124573. The reversal of 19781220124562 is 26542102218791.

It is a self number, because there is not a number n which added to its sum of digits gives 19781220124562.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 570309614 + ... + 570344297.

It is an arithmetic number, because the mean of its divisors is an integer number (1077917946840).

Almost surely, 2^{19781220124562} is an apocalyptic number.

19781220124562 is a deficient number, since it is larger than the sum of its proper divisors (14712154174318).

19781220124562 is a wasteful number, since it uses less digits than its factorization.

19781220124562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1140653978.

The product of its (nonzero) digits is 967680, while the sum is 50.

The spelling of 19781220124562 in words is "nineteen trillion, seven hundred eighty-one billion, two hundred twenty million, one hundred twenty-four thousand, five hundred sixty-two".