87408531655961 has 2 divisors, whose sum is σ = 87408531655962. Its totient is φ = 87408531655960.

The previous prime is 87408531655859. The next prime is 87408531655993. The reversal of 87408531655961 is 16955613580478.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46757642257936 + 40650889398025 = 6837956^2 + 6375805^2 .

It is a cyclic number.

It is not a de Polignac number, because 87408531655961 - 2⁴² = 83010485144857 is a prime.

It is a super-2 number, since 2×87408531655961² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 87408531655891 and 87408531655900.

It is not a weakly prime, because it can be changed into another prime (87408531657961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43704265827980 + 43704265827981.

It is an arithmetic number, because the mean of its divisors is an integer number (43704265827981).

Almost surely, 2^{87408531655961} is an apocalyptic number.

It is an amenable number.

87408531655961 is a deficient number, since it is larger than the sum of its proper divisors (1).

87408531655961 is an equidigital number, since it uses as much as digits as its factorization.

87408531655961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728000, while the sum is 68.

The spelling of 87408531655961 in words is "eighty-seven trillion, four hundred eight billion, five hundred thirty-one million, six hundred fifty-five thousand, nine hundred sixty-one".