87505551717669 has 24 divisors (see below), whose sum is σ = 133833171939480. Its totient is φ = 54904971737088.

The previous prime is 87505551717631. The next prime is 87505551717673. The reversal of 87505551717669 is 96671715550578.

87505551717669 is a `hidden beast` number, since 8 + 7 + 5 + 0 + 5 + 551 + 7 + 1 + 7 + 6 + 69 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 76299561141444 + 11205990576225 = 8734962^2 + 3347535^2 .

It is not a de Polignac number, because 87505551717669 - 2²⁹ = 87505014846757 is a prime.

It is a super-2 number, since 2×87505551717669² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 87505551717597 and 87505551717606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87505551717169) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15819339 + ... + 20621895.

It is an arithmetic number, because the mean of its divisors is an integer number (5576382164145).

Almost surely, 2^{87505551717669} is an apocalyptic number.

It is an amenable number.

87505551717669 is a deficient number, since it is larger than the sum of its proper divisors (46327620221811).

87505551717669 is a wasteful number, since it uses less digits than its factorization.

87505551717669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4921669 (or 4921666 counting only the distinct ones).

The product of its (nonzero) digits is 555660000, while the sum is 72.

The spelling of 87505551717669 in words is "eighty-seven trillion, five hundred five billion, five hundred fifty-one million, seven hundred seventeen thousand, six hundred sixty-nine".