87561939667 has 2 divisors, whose sum is σ = 87561939668. Its totient is φ = 87561939666.

The previous prime is 87561939587. The next prime is 87561939701. The reversal of 87561939667 is 76693916578.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87561939667 - 2¹⁵ = 87561906899 is a prime.

It is not a weakly prime, because it can be changed into another prime (87561934667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43780969833 + 43780969834.

It is an arithmetic number, because the mean of its divisors is an integer number (43780969834).

Almost surely, 2^87561939667 is an apocalyptic number.

87561939667 is a deficient number, since it is larger than the sum of its proper divisors (1).

87561939667 is an equidigital number, since it uses as much as digits as its factorization.

87561939667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 102876480, while the sum is 67.

The spelling of 87561939667 in words is "eighty-seven billion, five hundred sixty-one million, nine hundred thirty-nine thousand, six hundred sixty-seven".