71156209488 has 320 divisors, whose sum is σ = 232011816960. Its totient is φ = 18291142656.

The previous prime is 71156209447. The next prime is 71156209493. The reversal of 71156209488 is 88490265117.

It is a super-2 number, since 2×71156209488² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71156209488.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 63025308 + ... + 63026436.

It is an arithmetic number, because the mean of its divisors is an integer number (725036928).

Almost surely, 2^71156209488 is an apocalyptic number.

71156209488 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71156209488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116005908480).

71156209488 is an abundant number, since it is smaller than the sum of its proper divisors (160855607472).

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

71156209488 is a wasteful number, since it uses less digits than its factorization.

71156209488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1514 (or 1508 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 51.

The spelling of 71156209488 in words is "seventy-one billion, one hundred fifty-six million, two hundred nine thousand, four hundred eighty-eight".