71138278805 has 32 divisors (see below), whose sum is σ = 93531594240. Its totient is φ = 51512380480.

The previous prime is 71138278793. The next prime is 71138278831. The reversal of 71138278805 is 50887283117.

It is not a de Polignac number, because 71138278805 - 2¹² = 71138274709 is a prime.

It is a super-2 number, since 2×71138278805² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12971594 + ... + 12977076.

It is an arithmetic number, because the mean of its divisors is an integer number (2922862320).

Almost surely, 2^71138278805 is an apocalyptic number.

It is an amenable number.

71138278805 is a deficient number, since it is larger than the sum of its proper divisors (22393315435).

71138278805 is a wasteful number, since it uses less digits than its factorization.

71138278805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6481.

The product of its (nonzero) digits is 752640, while the sum is 50.

It can be divided in two parts, 71138 and 278805, that added together give a palindrome (349943).

The spelling of 71138278805 in words is "seventy-one billion, one hundred thirty-eight million, two hundred seventy-eight thousand, eight hundred five".