16378180309 has 2 divisors, whose sum is σ = 16378180310. Its totient is φ = 16378180308.

The previous prime is 16378180303. The next prime is 16378180339. The reversal of 16378180309 is 90308187361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13387184209 + 2990996100 = 115703^2 + 54690^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16378180309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16378180303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8189090154 + 8189090155.

It is an arithmetic number, because the mean of its divisors is an integer number (8189090155).

Almost surely, 2^16378180309 is an apocalyptic number.

It is an amenable number.

16378180309 is a deficient number, since it is larger than the sum of its proper divisors (1).

16378180309 is an equidigital number, since it uses as much as digits as its factorization.

16378180309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 46.

The spelling of 16378180309 in words is "sixteen billion, three hundred seventy-eight million, one hundred eighty thousand, three hundred nine".