71111045820 has 48 divisors (see below), whose sum is σ = 199819555488. Its totient is φ = 18895457280.

The previous prime is 71111045773. The next prime is 71111045821. The reversal of 71111045820 is 2854011117.

It is a super-2 number, since 2×71111045820² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71111045821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2092009 + ... + 2125728.

It is an arithmetic number, because the mean of its divisors is an integer number (4162907406).

Almost surely, 2^71111045820 is an apocalyptic number.

It is an amenable number.

71111045820 is an abundant number, since it is smaller than the sum of its proper divisors (128708509668).

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

71111045820 is a wasteful number, since it uses less digits than its factorization.

71111045820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4218030 (or 4218028 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 30.

Adding to 71111045820 its reverse (2854011117), we get a palindrome (73965056937).

The spelling of 71111045820 in words is "seventy-one billion, one hundred eleven million, forty-five thousand, eight hundred twenty".