87655223809 has 2 divisors, whose sum is σ = 87655223810. Its totient is φ = 87655223808.

The previous prime is 87655223771. The next prime is 87655223833. The reversal of 87655223809 is 90832255678.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78042009600 + 9613214209 = 279360^2 + 98047^2 .

It is a cyclic number.

It is not a de Polignac number, because 87655223809 - 2²³ = 87646835201 is a prime.

It is a super-2 number, since 2×87655223809² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 87655223809.

It is not a weakly prime, because it can be changed into another prime (87655223879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43827611904 + 43827611905.

It is an arithmetic number, because the mean of its divisors is an integer number (43827611905).

Almost surely, 2^87655223809 is an apocalyptic number.

It is an amenable number.

87655223809 is a deficient number, since it is larger than the sum of its proper divisors (1).

87655223809 is an equidigital number, since it uses as much as digits as its factorization.

87655223809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7257600, while the sum is 55.

The spelling of 87655223809 in words is "eighty-seven billion, six hundred fifty-five million, two hundred twenty-three thousand, eight hundred nine".