15983781007 has 2 divisors, whose sum is σ = 15983781008. Its totient is φ = 15983781006.

The previous prime is 15983780999. The next prime is 15983781019. The reversal of 15983781007 is 70018738951.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15983781007 - 2³ = 15983780999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15981781007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7991890503 + 7991890504.

It is an arithmetic number, because the mean of its divisors is an integer number (7991890504).

Almost surely, 2^15983781007 is an apocalyptic number.

15983781007 is a deficient number, since it is larger than the sum of its proper divisors (1).

15983781007 is an equidigital number, since it uses as much as digits as its factorization.

15983781007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 423360, while the sum is 49.

The spelling of 15983781007 in words is "fifteen billion, nine hundred eighty-three million, seven hundred eighty-one thousand, seven".