87380817651767 has 4 divisors (see below), whose sum is σ = 88577815153920. Its totient is φ = 86183820149616.

The previous prime is 87380817651733. The next prime is 87380817651779. The reversal of 87380817651767 is 76715671808378.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 87380817651767 - 2¹⁸ = 87380817389623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87380817651694 and 87380817651703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87380811651767) 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, 598498750967 + ... + 598498751112.

It is an arithmetic number, because the mean of its divisors is an integer number (22144453788480).

Almost surely, 2^{87380817651767} is an apocalyptic number.

87380817651767 is a deficient number, since it is larger than the sum of its proper divisors (1196997502153).

87380817651767 is a wasteful number, since it uses less digits than its factorization.

87380817651767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1196997502152.

The product of its (nonzero) digits is 663828480, while the sum is 74.

The spelling of 87380817651767 in words is "eighty-seven trillion, three hundred eighty billion, eight hundred seventeen million, six hundred fifty-one thousand, seven hundred sixty-seven".