71505547451 has 8 divisors (see below), whose sum is σ = 77292245520. Its totient is φ = 65759745312.

The previous prime is 71505547423. The next prime is 71505547483. The reversal of 71505547451 is 15474550517.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71505547451 is a prime.

It is a super-2 number, since 2×71505547451² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71505547411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10220345 + ... + 10227338.

It is an arithmetic number, because the mean of its divisors is an integer number (9661530690).

Almost surely, 2^71505547451 is an apocalyptic number.

71505547451 is a deficient number, since it is larger than the sum of its proper divisors (5786698069).

71505547451 is a wasteful number, since it uses less digits than its factorization.

71505547451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20447965.

The product of its (nonzero) digits is 490000, while the sum is 44.

The spelling of 71505547451 in words is "seventy-one billion, five hundred five million, five hundred forty-seven thousand, four hundred fifty-one".