19128440767 has 2 divisors, whose sum is σ = 19128440768. Its totient is φ = 19128440766.

The previous prime is 19128440729. The next prime is 19128440777. The reversal of 19128440767 is 76704482191.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19128440767 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19128440767.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19128440777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9564220383 + 9564220384.

It is an arithmetic number, because the mean of its divisors is an integer number (9564220384).

Almost surely, 2^19128440767 is an apocalyptic number.

19128440767 is a deficient number, since it is larger than the sum of its proper divisors (1).

19128440767 is an equidigital number, since it uses as much as digits as its factorization.

19128440767 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 677376, while the sum is 49.

The spelling of 19128440767 in words is "nineteen billion, one hundred twenty-eight million, four hundred forty thousand, seven hundred sixty-seven".