16781215664468 has 24 divisors (see below), whose sum is σ = 31094892549504. Its totient is φ = 7896969763200.

The previous prime is 16781215664467. The next prime is 16781215664491. The reversal of 16781215664468 is 86446651218761.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16781215664467) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6672023 + ... + 8836193.

It is an arithmetic number, because the mean of its divisors is an integer number (1295620522896).

Almost surely, 2^{16781215664468} is an apocalyptic number.

It is an amenable number.

16781215664468 is a deficient number, since it is larger than the sum of its proper divisors (14313676885036).

16781215664468 is a wasteful number, since it uses less digits than its factorization.

16781215664468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2278223 (or 2278221 counting only the distinct ones).

The product of its digits is 92897280, while the sum is 65.

The spelling of 16781215664468 in words is "sixteen trillion, seven hundred eighty-one billion, two hundred fifteen million, six hundred sixty-four thousand, four hundred sixty-eight".