78677534281 has 2 divisors, whose sum is σ = 78677534282. Its totient is φ = 78677534280.

The previous prime is 78677534237. The next prime is 78677534347. The reversal of 78677534281 is 18243577687.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45407774281 + 33269760000 = 213091^2 + 182400^2 .

It is a cyclic number.

It is not a de Polignac number, because 78677534281 - 2⁹ = 78677533769 is a prime.

It is a super-2 number, since 2×78677534281² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78677534231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39338767140 + 39338767141.

It is an arithmetic number, because the mean of its divisors is an integer number (39338767141).

Almost surely, 2^78677534281 is an apocalyptic number.

It is an amenable number.

78677534281 is a deficient number, since it is larger than the sum of its proper divisors (1).

78677534281 is an equidigital number, since it uses as much as digits as its factorization.

78677534281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15805440, while the sum is 58.

The spelling of 78677534281 in words is "seventy-eight billion, six hundred seventy-seven million, five hundred thirty-four thousand, two hundred eighty-one".