87440101669 has 2 divisors, whose sum is σ = 87440101670. Its totient is φ = 87440101668.

The previous prime is 87440101663. The next prime is 87440101699. The reversal of 87440101669 is 96610104478.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63989773444 + 23450328225 = 252962^2 + 153135^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87440101669 is a prime.

It is a super-2 number, since 2×87440101669² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87440101663) 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, 43720050834 + 43720050835.

It is an arithmetic number, because the mean of its divisors is an integer number (43720050835).

Almost surely, 2^87440101669 is an apocalyptic number.

It is an amenable number.

87440101669 is a deficient number, since it is larger than the sum of its proper divisors (1).

87440101669 is an equidigital number, since it uses as much as digits as its factorization.

87440101669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 46.

The spelling of 87440101669 in words is "eighty-seven billion, four hundred forty million, one hundred one thousand, six hundred sixty-nine".