87165381786517 has 4 divisors (see below), whose sum is σ = 87487025262016. Its totient is φ = 86843738311020.

The previous prime is 87165381786481. The next prime is 87165381786547. The reversal of 87165381786517 is 71568718356178.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87165381786517 - 2³¹ = 87163234302869 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87165381786517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87165381786547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160821737343 + ... + 160821737884.

It is an arithmetic number, because the mean of its divisors is an integer number (21871756315504).

Almost surely, 2^{87165381786517} is an apocalyptic number.

It is an amenable number.

87165381786517 is a deficient number, since it is larger than the sum of its proper divisors (321643475499).

87165381786517 is a wasteful number, since it uses less digits than its factorization.

87165381786517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321643475498.

The product of its digits is 474163200, while the sum is 73.

The spelling of 87165381786517 in words is "eighty-seven trillion, one hundred sixty-five billion, three hundred eighty-one million, seven hundred eighty-six thousand, five hundred seventeen".