787887535681 has 2 divisors, whose sum is σ = 787887535682. Its totient is φ = 787887535680.

The previous prime is 787887535637. The next prime is 787887535717. The reversal of 787887535681 is 186535788787.

787887535681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 782472930625 + 5414605056 = 884575^2 + 73584^2 .

It is an emirp because it is prime and its reverse (186535788787) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-787887535681 is a prime.

It is a super-2 number, since 2×787887535681² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (787887535781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 393943767840 + 393943767841.

It is an arithmetic number, because the mean of its divisors is an integer number (393943767841).

Almost surely, 2^787887535681 is an apocalyptic number.

It is an amenable number.

787887535681 is a deficient number, since it is larger than the sum of its proper divisors (1).

787887535681 is an equidigital number, since it uses as much as digits as its factorization.

787887535681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 632217600, while the sum is 73.

The spelling of 787887535681 in words is "seven hundred eighty-seven billion, eight hundred eighty-seven million, five hundred thirty-five thousand, six hundred eighty-one".