388454363454881 has 2 divisors, whose sum is σ = 388454363454882. Its totient is φ = 388454363454880.

The previous prime is 388454363454827. The next prime is 388454363454893. The reversal of 388454363454881 is 188454363454883.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 231136043579281 + 157318319875600 = 15203159^2 + 12542660^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-388454363454881 is a prime.

It is a super-2 number, since 2×388454363454881² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 388454363454799 and 388454363454808.

It is not a weakly prime, because it can be changed into another prime (388454363453881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194227181727440 + 194227181727441.

It is an arithmetic number, because the mean of its divisors is an integer number (194227181727441).

Almost surely, 2^{388454363454881} is an apocalyptic number.

It is an amenable number.

388454363454881 is a deficient number, since it is larger than the sum of its proper divisors (1).

388454363454881 is an equidigital number, since it uses as much as digits as its factorization.

388454363454881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4246732800, while the sum is 74.

The spelling of 388454363454881 in words is "three hundred eighty-eight trillion, four hundred fifty-four billion, three hundred sixty-three million, four hundred fifty-four thousand, eight hundred eighty-one".