71721054177 has 4 divisors (see below), whose sum is σ = 95628072240. Its totient is φ = 47814036116.

The previous prime is 71721054131. The next prime is 71721054191. The reversal of 71721054177 is 77145012717.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71721054177 - 2⁷ = 71721054049 is a prime.

It is a super-2 number, since 2×71721054177² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71721054277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11953509027 + ... + 11953509032.

It is an arithmetic number, because the mean of its divisors is an integer number (23907018060).

Almost surely, 2^71721054177 is an apocalyptic number.

It is an amenable number.

71721054177 is a deficient number, since it is larger than the sum of its proper divisors (23907018063).

71721054177 is a wasteful number, since it uses less digits than its factorization.

71721054177 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23907018062.

The product of its (nonzero) digits is 96040, while the sum is 42.

The spelling of 71721054177 in words is "seventy-one billion, seven hundred twenty-one million, fifty-four thousand, one hundred seventy-seven".