81075770526784 has 42 divisors (see below), whose sum is σ = 176840242781342. Its totient is φ = 36852622963200.

The previous prime is 81075770526763. The next prime is 81075770526809. The reversal of 81075770526784 is 48762507757018.

81075770526784 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 80459608325184 + 616162201600 = 8969928^2 + 784960^2 .

It is a super-2 number, since 2×81075770526784² (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 5 ways as a sum of consecutive naturals, for example, 5234739837 + ... + 5234755324.

Almost surely, 2^{81075770526784} is an apocalyptic number.

It is an amenable number.

81075770526784 is an abundant number, since it is smaller than the sum of its proper divisors (95764472254558).

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

81075770526784 is a wasteful number, since it uses less digits than its factorization.

81075770526784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10469495195 (or 10469495174 counting only the distinct ones).

The product of its (nonzero) digits is 184396800, while the sum is 67.

The spelling of 81075770526784 in words is "eighty-one trillion, seventy-five billion, seven hundred seventy million, five hundred twenty-six thousand, seven hundred eighty-four".