16780369457 has 2 divisors, whose sum is σ = 16780369458. Its totient is φ = 16780369456.

The previous prime is 16780369451. The next prime is 16780369477. The reversal of 16780369457 is 75496308761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15765564721 + 1014804736 = 125561^2 + 31856^2 .

It is a cyclic number.

It is not a de Polignac number, because 16780369457 - 2¹⁸ = 16780107313 is a prime.

It is a super-2 number, since 2×16780369457² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16780369451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8390184728 + 8390184729.

It is an arithmetic number, because the mean of its divisors is an integer number (8390184729).

Almost surely, 2^16780369457 is an apocalyptic number.

It is an amenable number.

16780369457 is a deficient number, since it is larger than the sum of its proper divisors (1).

16780369457 is an equidigital number, since it uses as much as digits as its factorization.

16780369457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7620480, while the sum is 56.

The spelling of 16780369457 in words is "sixteen billion, seven hundred eighty million, three hundred sixty-nine thousand, four hundred fifty-seven".