71815061021298 has 128 divisors (see below), whose sum is σ = 178109523357696. Its totient is φ = 18833627596800.

The previous prime is 71815061021261. The next prime is 71815061021299. The reversal of 71815061021298 is 89212016051817.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 71815061021298.

It is not an unprimeable number, because it can be changed into a prime (71815061021299) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 78909361 + ... + 79814267.

It is an arithmetic number, because the mean of its divisors is an integer number (1391480651232).

Almost surely, 2^{71815061021298} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71815061021298, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89054761678848).

71815061021298 is an abundant number, since it is smaller than the sum of its proper divisors (106294462336398).

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

71815061021298 is a wasteful number, since it uses less digits than its factorization.

71815061021298 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907688.

The product of its (nonzero) digits is 483840, while the sum is 51.

The spelling of 71815061021298 in words is "seventy-one trillion, eight hundred fifteen billion, sixty-one million, twenty-one thousand, two hundred ninety-eight".