71515213245 has 96 divisors (see below), whose sum is σ = 144176557824. Its totient is φ = 32115225600.

The previous prime is 71515213241. The next prime is 71515213247. The reversal of 71515213245 is 54231251517.

71515213245 is a `hidden beast` number, since 7 + 1 + 515 + 2 + 132 + 4 + 5 = 666.

It is not a de Polignac number, because 71515213245 - 2² = 71515213241 is a prime.

It is a super-2 number, since 2×71515213245² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71515213241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 18655849 + ... + 18659681.

It is an arithmetic number, because the mean of its divisors is an integer number (1501839144).

Almost surely, 2^71515213245 is an apocalyptic number.

It is an amenable number.

71515213245 is an abundant number, since it is smaller than the sum of its proper divisors (72661344579).

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

71515213245 is a wasteful number, since it uses less digits than its factorization.

71515213245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4883 (or 4880 counting only the distinct ones).

The product of its digits is 42000, while the sum is 36.

The spelling of 71515213245 in words is "seventy-one billion, five hundred fifteen million, two hundred thirteen thousand, two hundred forty-five".