78637675573 has 2 divisors, whose sum is σ = 78637675574. Its totient is φ = 78637675572.

The previous prime is 78637675553. The next prime is 78637675577. The reversal of 78637675573 is 37557673687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78566408209 + 71267364 = 280297^2 + 8442^2 .

It is an emirp because it is prime and its reverse (37557673687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78637675573 - 2³³ = 70047740981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78637675577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39318837786 + 39318837787.

It is an arithmetic number, because the mean of its divisors is an integer number (39318837787).

Almost surely, 2^78637675573 is an apocalyptic number.

It is an amenable number.

78637675573 is a deficient number, since it is larger than the sum of its proper divisors (1).

78637675573 is an equidigital number, since it uses as much as digits as its factorization.

78637675573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155584800, while the sum is 64.

The spelling of 78637675573 in words is "seventy-eight billion, six hundred thirty-seven million, six hundred seventy-five thousand, five hundred seventy-three".