16781215664467 has 2 divisors, whose sum is σ = 16781215664468. Its totient is φ = 16781215664466.

The previous prime is 16781215664449. The next prime is 16781215664491. The reversal of 16781215664467 is 76446651218761.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16781215664467 - 2²⁷ = 16781081446739 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16781215664399 and 16781215664408.

It is not a weakly prime, because it can be changed into another prime (16781215664407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8390607832233 + 8390607832234.

It is an arithmetic number, because the mean of its divisors is an integer number (8390607832234).

Almost surely, 2^{16781215664467} is an apocalyptic number.

16781215664467 is a deficient number, since it is larger than the sum of its proper divisors (1).

16781215664467 is an equidigital number, since it uses as much as digits as its factorization.

16781215664467 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81285120, while the sum is 64.

The spelling of 16781215664467 in words is "sixteen trillion, seven hundred eighty-one billion, two hundred fifteen million, six hundred sixty-four thousand, four hundred sixty-seven".