71547640105 has 16 divisors (see below), whose sum is σ = 87739902720. Its totient is φ = 55984511232.

The previous prime is 71547640091. The next prime is 71547640133. The reversal of 71547640105 is 50104674517.

It is a cyclic number.

It is not a de Polignac number, because 71547640105 - 2¹⁹ = 71547115817 is a prime.

It is a super-2 number, since 2×71547640105² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 274657 + ... + 467473.

It is an arithmetic number, because the mean of its divisors is an integer number (5483743920).

Almost surely, 2^71547640105 is an apocalyptic number.

It is an amenable number.

71547640105 is a deficient number, since it is larger than the sum of its proper divisors (16192262615).

71547640105 is a wasteful number, since it uses less digits than its factorization.

71547640105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194448.

The product of its (nonzero) digits is 117600, while the sum is 40.

The spelling of 71547640105 in words is "seventy-one billion, five hundred forty-seven million, six hundred forty thousand, one hundred five".