87509257757 has 2 divisors, whose sum is σ = 87509257758. Its totient is φ = 87509257756.

The previous prime is 87509257753. The next prime is 87509257769. The reversal of 87509257757 is 75775290578.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87508880761 + 376996 = 295819^2 + 614^2 .

It is a cyclic number.

It is not a de Polignac number, because 87509257757 - 2² = 87509257753 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87509257757.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87509257753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43754628878 + 43754628879.

It is an arithmetic number, because the mean of its divisors is an integer number (43754628879).

Almost surely, 2^87509257757 is an apocalyptic number.

It is an amenable number.

87509257757 is a deficient number, since it is larger than the sum of its proper divisors (1).

87509257757 is an equidigital number, since it uses as much as digits as its factorization.

87509257757 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43218000, while the sum is 62.

The spelling of 87509257757 in words is "eighty-seven billion, five hundred nine million, two hundred fifty-seven thousand, seven hundred fifty-seven".