71518815403 has 4 divisors (see below), whose sum is σ = 81735789040. Its totient is φ = 61301841768.

The previous prime is 71518815371. The next prime is 71518815451. The reversal of 71518815403 is 30451881517.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71518815403 - 2⁵ = 71518815371 is a prime.

It is a super-2 number, since 2×71518815403² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71518815403.

It is not an unprimeable number, because it can be changed into a prime (71518816403) 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 3 ways as a sum of consecutive naturals, for example, 5108486808 + ... + 5108486821.

It is an arithmetic number, because the mean of its divisors is an integer number (20433947260).

Almost surely, 2^71518815403 is an apocalyptic number.

71518815403 is a deficient number, since it is larger than the sum of its proper divisors (10216973637).

71518815403 is a wasteful number, since it uses less digits than its factorization.

71518815403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10216973636.

The product of its (nonzero) digits is 134400, while the sum is 43.

The spelling of 71518815403 in words is "seventy-one billion, five hundred eighteen million, eight hundred fifteen thousand, four hundred three".