787942591649 has 2 divisors, whose sum is σ = 787942591650. Its totient is φ = 787942591648.

The previous prime is 787942591643. The next prime is 787942591697. The reversal of 787942591649 is 946195249787.

787942591649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 702339535249 + 85603056400 = 838057^2 + 292580^2 .

It is a cyclic number.

It is not a de Polignac number, because 787942591649 - 2⁸ = 787942591393 is a prime.

It is not a weakly prime, because it can be changed into another prime (787942591643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 393971295824 + 393971295825.

It is an arithmetic number, because the mean of its divisors is an integer number (393971295825).

Almost surely, 2^787942591649 is an apocalyptic number.

It is an amenable number.

787942591649 is a deficient number, since it is larger than the sum of its proper divisors (1).

787942591649 is an equidigital number, since it uses as much as digits as its factorization.

787942591649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 274337280, while the sum is 71.

The spelling of 787942591649 in words is "seven hundred eighty-seven billion, nine hundred forty-two million, five hundred ninety-one thousand, six hundred forty-nine".