87320583178391 has 2 divisors, whose sum is σ = 87320583178392. Its totient is φ = 87320583178390.

The previous prime is 87320583178313. The next prime is 87320583178457. The reversal of 87320583178391 is 19387138502378.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87320583178391 - 2⁴² = 82922536667287 is a prime.

It is a super-2 number, since 2×87320583178391² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87320583148391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43660291589195 + 43660291589196.

It is an arithmetic number, because the mean of its divisors is an integer number (43660291589196).

Almost surely, 2^{87320583178391} is an apocalyptic number.

87320583178391 is a deficient number, since it is larger than the sum of its proper divisors (1).

87320583178391 is an equidigital number, since it uses as much as digits as its factorization.

87320583178391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60963840, while the sum is 65.

The spelling of 87320583178391 in words is "eighty-seven trillion, three hundred twenty billion, five hundred eighty-three million, one hundred seventy-eight thousand, three hundred ninety-one".