87705144937 has 2 divisors, whose sum is σ = 87705144938. Its totient is φ = 87705144936.

The previous prime is 87705144931. The next prime is 87705144953. The reversal of 87705144937 is 73944150778.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71982743616 + 15722401321 = 268296^2 + 125389^2 .

It is a cyclic number.

It is not a de Polignac number, because 87705144937 - 2³ = 87705144929 is a prime.

It is not a weakly prime, because it can be changed into another prime (87705144931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43852572468 + 43852572469.

It is an arithmetic number, because the mean of its divisors is an integer number (43852572469).

Almost surely, 2^87705144937 is an apocalyptic number.

It is an amenable number.

87705144937 is a deficient number, since it is larger than the sum of its proper divisors (1).

87705144937 is an equidigital number, since it uses as much as digits as its factorization.

87705144937 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5927040, while the sum is 55.

The spelling of 87705144937 in words is "eighty-seven billion, seven hundred five million, one hundred forty-four thousand, nine hundred thirty-seven".