78245911889 has 2 divisors, whose sum is σ = 78245911890. Its totient is φ = 78245911888.

The previous prime is 78245911879. The next prime is 78245911963. The reversal of 78245911889 is 98811954287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72886500625 + 5359411264 = 269975^2 + 73208^2 .

It is a cyclic number.

It is not a de Polignac number, because 78245911889 - 2¹⁶ = 78245846353 is a prime.

It is a super-2 number, since 2×78245911889² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78245911829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39122955944 + 39122955945.

It is an arithmetic number, because the mean of its divisors is an integer number (39122955945).

Almost surely, 2^78245911889 is an apocalyptic number.

It is an amenable number.

78245911889 is a deficient number, since it is larger than the sum of its proper divisors (1).

78245911889 is an equidigital number, since it uses as much as digits as its factorization.

78245911889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11612160, while the sum is 62.

The spelling of 78245911889 in words is "seventy-eight billion, two hundred forty-five million, nine hundred eleven thousand, eight hundred eighty-nine".