78789898757 has 2 divisors, whose sum is σ = 78789898758. Its totient is φ = 78789898756.

The previous prime is 78789898741. The next prime is 78789898771. The reversal of 78789898757 is 75789898787.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66713207521 + 12076691236 = 258289^2 + 109894^2 .

It is an emirp because it is prime and its reverse (75789898787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78789898757 - 2⁴ = 78789898741 is a prime.

It is a super-2 number, since 2×78789898757² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78789898717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39394949378 + 39394949379.

It is an arithmetic number, because the mean of its divisors is an integer number (39394949379).

Almost surely, 2^78789898757 is an apocalyptic number.

It is an amenable number.

78789898757 is a deficient number, since it is larger than the sum of its proper divisors (1).

78789898757 is an equidigital number, since it uses as much as digits as its factorization.

78789898757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3982970880, while the sum is 83.

The spelling of 78789898757 in words is "seventy-eight billion, seven hundred eighty-nine million, eight hundred ninety-eight thousand, seven hundred fifty-seven".