78043125553 has 2 divisors, whose sum is σ = 78043125554. Its totient is φ = 78043125552.

The previous prime is 78043125527. The next prime is 78043125571. The reversal of 78043125553 is 35552134087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70364459169 + 7678666384 = 265263^2 + 87628^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78043125553 is a prime.

It is not a weakly prime, because it can be changed into another prime (78043125593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39021562776 + 39021562777.

It is an arithmetic number, because the mean of its divisors is an integer number (39021562777).

Almost surely, 2^78043125553 is an apocalyptic number.

It is an amenable number.

78043125553 is a deficient number, since it is larger than the sum of its proper divisors (1).

78043125553 is an equidigital number, since it uses as much as digits as its factorization.

78043125553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504000, while the sum is 43.

The spelling of 78043125553 in words is "seventy-eight billion, forty-three million, one hundred twenty-five thousand, five hundred fifty-three".