71581671553740 has 96 divisors (see below), whose sum is σ = 205320109962240. Its totient is φ = 18622608576000.

The previous prime is 71581671553727. The next prime is 71581671553741. The reversal of 71581671553740 is 4735517618517.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is not an unprimeable number, because it can be changed into a prime (71581671553741) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 220054215 + ... + 220379265.

It is an arithmetic number, because the mean of its divisors is an integer number (2138751145440).

Almost surely, 2^{71581671553740} is an apocalyptic number.

It is an amenable number.

71581671553740 is an abundant number, since it is smaller than the sum of its proper divisors (133738438408500).

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

71581671553740 is a wasteful number, since it uses less digits than its factorization.

71581671553740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414623 (or 414621 counting only the distinct ones).

The product of its (nonzero) digits is 24696000, while the sum is 60.

The spelling of 71581671553740 in words is "seventy-one trillion, five hundred eighty-one billion, six hundred seventy-one million, five hundred fifty-three thousand, seven hundred forty".