78648454010881 has 2 divisors, whose sum is σ = 78648454010882. Its totient is φ = 78648454010880.

The previous prime is 78648454010857. The next prime is 78648454010891. The reversal of 78648454010881 is 18801045484687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51114506612481 + 27533947398400 = 7149441^2 + 5247280^2 .

It is a cyclic number.

It is not a de Polignac number, because 78648454010881 - 2¹⁵ = 78648453978113 is a prime.

It is a super-2 number, since 2×78648454010881² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78648454010831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39324227005440 + 39324227005441.

It is an arithmetic number, because the mean of its divisors is an integer number (39324227005441).

Almost surely, 2^{78648454010881} is an apocalyptic number.

It is an amenable number.

78648454010881 is a deficient number, since it is larger than the sum of its proper divisors (1).

78648454010881 is an equidigital number, since it uses as much as digits as its factorization.

78648454010881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55050240, while the sum is 64.

The spelling of 78648454010881 in words is "seventy-eight trillion, six hundred forty-eight billion, four hundred fifty-four million, ten thousand, eight hundred eighty-one".