78857028541 has 2 divisors, whose sum is σ = 78857028542. Its totient is φ = 78857028540.

The previous prime is 78857028473. The next prime is 78857028577. The reversal of 78857028541 is 14582075887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44003872441 + 34853156100 = 209771^2 + 186690^2 .

It is a cyclic number.

It is not a de Polignac number, because 78857028541 - 2⁷ = 78857028413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78857028241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39428514270 + 39428514271.

It is an arithmetic number, because the mean of its divisors is an integer number (39428514271).

Almost surely, 2^78857028541 is an apocalyptic number.

It is an amenable number.

78857028541 is a deficient number, since it is larger than the sum of its proper divisors (1).

78857028541 is an equidigital number, since it uses as much as digits as its factorization.

78857028541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5017600, while the sum is 55.

The spelling of 78857028541 in words is "seventy-eight billion, eight hundred fifty-seven million, twenty-eight thousand, five hundred forty-one".