787647821713 has 2 divisors, whose sum is σ = 787647821714. Its totient is φ = 787647821712.

The previous prime is 787647821699. The next prime is 787647821717. The reversal of 787647821713 is 317128746787.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 607865037649 + 179782784064 = 779657^2 + 424008^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-787647821713 is a prime.

It is not a weakly prime, because it can be changed into another prime (787647821717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 393823910856 + 393823910857.

It is an arithmetic number, because the mean of its divisors is an integer number (393823910857).

Almost surely, 2^787647821713 is an apocalyptic number.

It is an amenable number.

787647821713 is a deficient number, since it is larger than the sum of its proper divisors (1).

787647821713 is an equidigital number, since it uses as much as digits as its factorization.

787647821713 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22127616, while the sum is 61.

The spelling of 787647821713 in words is "seven hundred eighty-seven billion, six hundred forty-seven million, eight hundred twenty-one thousand, seven hundred thirteen".