87938537257 has 2 divisors, whose sum is σ = 87938537258. Its totient is φ = 87938537256.

The previous prime is 87938537213. The next prime is 87938537299. The reversal of 87938537257 is 75273583978.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59909415696 + 28029121561 = 244764^2 + 167419^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87938537257 is a prime.

It is not a weakly prime, because it can be changed into another prime (87938537207) 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, 43969268628 + 43969268629.

It is an arithmetic number, because the mean of its divisors is an integer number (43969268629).

Almost surely, 2^87938537257 is an apocalyptic number.

It is an amenable number.

87938537257 is a deficient number, since it is larger than the sum of its proper divisors (1).

87938537257 is an equidigital number, since it uses as much as digits as its factorization.

87938537257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 88905600, while the sum is 64.

It can be divided in two parts, 8793853 and 7257, that added together give a triangular number (8801110 = T₄₁₉₅).

The spelling of 87938537257 in words is "eighty-seven billion, nine hundred thirty-eight million, five hundred thirty-seven thousand, two hundred fifty-seven".