81257111420058 has 96 divisors (see below), whose sum is σ = 202089341705472. Its totient is φ = 23114769350400.

The previous prime is 81257111420057. The next prime is 81257111420161. The reversal of 81257111420058 is 85002411175218.

81257111420058 is a `hidden beast` number, since 8 + 1 + 2 + 571 + 1 + 1 + 4 + 20 + 0 + 58 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 81257111419995 and 81257111420022.

It is not an unprimeable number, because it can be changed into a prime (81257111420057) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 42363268 + ... + 44239808.

It is an arithmetic number, because the mean of its divisors is an integer number (2105097309432).

Almost surely, 2^{81257111420058} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81257111420058, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101044670852736).

81257111420058 is an abundant number, since it is smaller than the sum of its proper divisors (120832230285414).

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

81257111420058 is a wasteful number, since it uses less digits than its factorization.

81257111420058 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1878060 (or 1878057 counting only the distinct ones).

The product of its (nonzero) digits is 179200, while the sum is 45.

The spelling of 81257111420058 in words is "eighty-one trillion, two hundred fifty-seven billion, one hundred eleven million, four hundred twenty thousand, fifty-eight".