787942591643 has 2 divisors, whose sum is σ = 787942591644. Its totient is φ = 787942591642.

The previous prime is 787942591619. The next prime is 787942591649. The reversal of 787942591643 is 346195249787.

It is a strong prime.

It is an emirp because it is prime and its reverse (346195249787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 787942591643 - 2¹² = 787942587547 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 787942591643.

It is not a weakly prime, because it can be changed into another prime (787942591649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 393971295821 + 393971295822.

It is an arithmetic number, because the mean of its divisors is an integer number (393971295822).

Almost surely, 2^787942591643 is an apocalyptic number.

787942591643 is a deficient number, since it is larger than the sum of its proper divisors (1).

787942591643 is an equidigital number, since it uses as much as digits as its factorization.

787942591643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 91445760, while the sum is 65.

The spelling of 787942591643 in words is "seven hundred eighty-seven billion, nine hundred forty-two million, five hundred ninety-one thousand, six hundred forty-three".