71643251047 has 4 divisors (see below), whose sum is σ = 73390647456. Its totient is φ = 69895854640.

The previous prime is 71643250963. The next prime is 71643251051. The reversal of 71643251047 is 74015234617.

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 71643251047 - 2³¹ = 69495767399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71643251447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 873698143 + ... + 873698224.

It is an arithmetic number, because the mean of its divisors is an integer number (18347661864).

Almost surely, 2^71643251047 is an apocalyptic number.

71643251047 is a deficient number, since it is larger than the sum of its proper divisors (1747396409).

71643251047 is a wasteful number, since it uses less digits than its factorization.

71643251047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1747396408.

The product of its (nonzero) digits is 141120, while the sum is 40.

The spelling of 71643251047 in words is "seventy-one billion, six hundred forty-three million, two hundred fifty-one thousand, forty-seven".