81428864455 has 16 divisors (see below), whose sum is σ = 99395683200. Its totient is φ = 64022947360.

The previous prime is 81428864443. The next prime is 81428864467. The reversal of 81428864455 is 55446882418.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81428864443) and next prime (81428864467).

It is not a de Polignac number, because 81428864455 - 2²⁹ = 80891993543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81428864396 and 81428864405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1224000 + ... + 1288810.

It is an arithmetic number, because the mean of its divisors is an integer number (6212230200).

Almost surely, 2^81428864455 is an apocalyptic number.

81428864455 is a deficient number, since it is larger than the sum of its proper divisors (17966818745).

81428864455 is a wasteful number, since it uses less digits than its factorization.

81428864455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69134.

The product of its digits is 9830400, while the sum is 55.

The spelling of 81428864455 in words is "eighty-one billion, four hundred twenty-eight million, eight hundred sixty-four thousand, four hundred fifty-five".