1798783507987 has 2 divisors, whose sum is σ = 1798783507988. Its totient is φ = 1798783507986.

The previous prime is 1798783507973. The next prime is 1798783508023. The reversal of 1798783507987 is 7897053878971.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1798783507987 is a prime.

It is not a weakly prime, because it can be changed into another prime (1798783507907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 899391753993 + 899391753994.

It is an arithmetic number, because the mean of its divisors is an integer number (899391753994).

Almost surely, 2^{1798783507987} is an apocalyptic number.

1798783507987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1798783507987 is an equidigital number, since it uses as much as digits as its factorization.

1798783507987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1493614080, while the sum is 79.

The spelling of 1798783507987 in words is "one trillion, seven hundred ninety-eight billion, seven hundred eighty-three million, five hundred seven thousand, nine hundred eighty-seven".