87805815667 has 2 divisors, whose sum is σ = 87805815668. Its totient is φ = 87805815666.

The previous prime is 87805815653. The next prime is 87805815673. The reversal of 87805815667 is 76651850878.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87805815667 - 2¹¹ = 87805813619 is a prime.

It is a super-2 number, since 2×87805815667² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (87805815607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43902907833 + 43902907834.

It is an arithmetic number, because the mean of its divisors is an integer number (43902907834).

Almost surely, 2^87805815667 is an apocalyptic number.

87805815667 is a deficient number, since it is larger than the sum of its proper divisors (1).

87805815667 is an equidigital number, since it uses as much as digits as its factorization.

87805815667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22579200, while the sum is 61.

The spelling of 87805815667 in words is "eighty-seven billion, eight hundred five million, eight hundred fifteen thousand, six hundred sixty-seven".