87778576357 has 2 divisors, whose sum is σ = 87778576358. Its totient is φ = 87778576356.

The previous prime is 87778576313. The next prime is 87778576381. The reversal of 87778576357 is 75367587778.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64288109601 + 23490466756 = 253551^2 + 153266^2 .

It is a cyclic number.

It is not a de Polignac number, because 87778576357 - 2⁷ = 87778576229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87778576057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43889288178 + 43889288179.

It is an arithmetic number, because the mean of its divisors is an integer number (43889288179).

Almost surely, 2^87778576357 is an apocalyptic number.

It is an amenable number.

87778576357 is a deficient number, since it is larger than the sum of its proper divisors (1).

87778576357 is an equidigital number, since it uses as much as digits as its factorization.

87778576357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 484041600, while the sum is 70.

The spelling of 87778576357 in words is "eighty-seven billion, seven hundred seventy-eight million, five hundred seventy-six thousand, three hundred fifty-seven".