81435169208780 has 48 divisors (see below), whose sum is σ = 171079743885120. Its totient is φ = 32561519198208.

The previous prime is 81435169208707. The next prime is 81435169208821. The reversal of 81435169208780 is 8780296153418.

81435169208780 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×81435169208780² (a number of 29 digits) contains 22 as substring.

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, 902313617 + ... + 902403863.

It is an arithmetic number, because the mean of its divisors is an integer number (3564161330940).

It is a 1-persistent number, because it is pandigital, but 2⋅81435169208780 = 162870338417560 is not.

Almost surely, 2^{81435169208780} is an apocalyptic number.

It is an amenable number.

81435169208780 is an abundant number, since it is smaller than the sum of its proper divisors (89644574676340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81435169208780 is a wasteful number, since it uses less digits than its factorization.

81435169208780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107138 (or 107136 counting only the distinct ones).

The product of its (nonzero) digits is 23224320, while the sum is 62.

The spelling of 81435169208780 in words is "eighty-one trillion, four hundred thirty-five billion, one hundred sixty-nine million, two hundred eight thousand, seven hundred eighty".