71506240055 has 64 divisors (see below), whose sum is σ = 95554142208. Its totient is φ = 51128340480.

The previous prime is 71506240051. The next prime is 71506240081. The reversal of 71506240055 is 55004260517.

It is not a de Polignac number, because 71506240055 - 2² = 71506240051 is a prime.

It is a super-2 number, since 2×71506240055² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71506239997 and 71506240024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71506240051) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 42894332 + ... + 42895998.

It is an arithmetic number, because the mean of its divisors is an integer number (1493033472).

Almost surely, 2^71506240055 is an apocalyptic number.

71506240055 is a deficient number, since it is larger than the sum of its proper divisors (24047902153).

71506240055 is a wasteful number, since it uses less digits than its factorization.

71506240055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2016.

The product of its (nonzero) digits is 42000, while the sum is 35.

The spelling of 71506240055 in words is "seventy-one billion, five hundred six million, two hundred forty thousand, fifty-five".