87508158781 has 2 divisors, whose sum is σ = 87508158782. Its totient is φ = 87508158780.

The previous prime is 87508158763. The next prime is 87508158821. The reversal of 87508158781 is 18785180578.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79265334681 + 8242824100 = 281541^2 + 90790^2 .

It is a cyclic number.

It is not a de Polignac number, because 87508158781 - 2¹⁹ = 87507634493 is a prime.

It is a super-2 number, since 2×87508158781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87508258781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43754079390 + 43754079391.

It is an arithmetic number, because the mean of its divisors is an integer number (43754079391).

Almost surely, 2^87508158781 is an apocalyptic number.

It is an amenable number.

87508158781 is a deficient number, since it is larger than the sum of its proper divisors (1).

87508158781 is an equidigital number, since it uses as much as digits as its factorization.

87508158781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5017600, while the sum is 58.

The spelling of 87508158781 in words is "eighty-seven billion, five hundred eight million, one hundred fifty-eight thousand, seven hundred eighty-one".