86615423857 has 2 divisors, whose sum is σ = 86615423858. Its totient is φ = 86615423856.

The previous prime is 86615423849. The next prime is 86615423863. The reversal of 86615423857 is 75832451668.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65081622321 + 21533801536 = 255111^2 + 146744^2 .

It is a cyclic number.

It is not a de Polignac number, because 86615423857 - 2³ = 86615423849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 86615423798 and 86615423807.

It is not a weakly prime, because it can be changed into another prime (86615421857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43307711928 + 43307711929.

It is an arithmetic number, because the mean of its divisors is an integer number (43307711929).

Almost surely, 2^86615423857 is an apocalyptic number.

It is an amenable number.

86615423857 is a deficient number, since it is larger than the sum of its proper divisors (1).

86615423857 is an equidigital number, since it uses as much as digits as its factorization.

86615423857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9676800, while the sum is 55.

The spelling of 86615423857 in words is "eighty-six billion, six hundred fifteen million, four hundred twenty-three thousand, eight hundred fifty-seven".