78225087413881 has 2 divisors, whose sum is σ = 78225087413882. Its totient is φ = 78225087413880.

The previous prime is 78225087413827. The next prime is 78225087413897. The reversal of 78225087413881 is 18831478052287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65713720960000 + 12511366453881 = 8106400^2 + 3537141^2 .

It is a cyclic number.

It is not a de Polignac number, because 78225087413881 - 2²⁷ = 78224953196153 is a prime.

It is a super-2 number, since 2×78225087413881² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78225087413821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39112543706940 + 39112543706941.

It is an arithmetic number, because the mean of its divisors is an integer number (39112543706941).

Almost surely, 2^{78225087413881} is an apocalyptic number.

It is an amenable number.

78225087413881 is a deficient number, since it is larger than the sum of its proper divisors (1).

78225087413881 is an equidigital number, since it uses as much as digits as its factorization.

78225087413881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48168960, while the sum is 64.

The spelling of 78225087413881 in words is "seventy-eight trillion, two hundred twenty-five billion, eighty-seven million, four hundred thirteen thousand, eight hundred eighty-one".