19861057904 has 20 divisors (see below), whose sum is σ = 38484936360. Its totient is φ = 9929461440.

The previous prime is 19861057877. The next prime is 19861057907. The reversal of 19861057904 is 40975016891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19861057907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99287 + ... + 222665.

It is an arithmetic number, because the mean of its divisors is an integer number (1924246818).

Almost surely, 2^19861057904 is an apocalyptic number.

It is an amenable number.

19861057904 is a deficient number, since it is larger than the sum of its proper divisors (18623878456).

19861057904 is a wasteful number, since it uses less digits than its factorization.

19861057904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133448 (or 133442 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 50.

The spelling of 19861057904 in words is "nineteen billion, eight hundred sixty-one million, fifty-seven thousand, nine hundred four".