15781643051 has 2 divisors, whose sum is σ = 15781643052. Its totient is φ = 15781643050.

The previous prime is 15781642927. The next prime is 15781643069. The reversal of 15781643051 is 15034618751.

15781643051 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (15034618751) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15781643051 is a prime.

It is not a weakly prime, because it can be changed into another prime (15781643551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7890821525 + 7890821526.

It is an arithmetic number, because the mean of its divisors is an integer number (7890821526).

Almost surely, 2^15781643051 is an apocalyptic number.

15781643051 is a deficient number, since it is larger than the sum of its proper divisors (1).

15781643051 is an equidigital number, since it uses as much as digits as its factorization.

15781643051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100800, while the sum is 41.

The spelling of 15781643051 in words is "fifteen billion, seven hundred eighty-one million, six hundred forty-three thousand, fifty-one".