71677181021 has 4 divisors (see below), whose sum is σ = 71677892832. Its totient is φ = 71676469212.

The previous prime is 71677181011. The next prime is 71677181027. The reversal of 71677181021 is 12018177617.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 71677181021 - 2²² = 71672986717 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71677181021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71677181027) 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, 173801 + ... + 416606.

It is an arithmetic number, because the mean of its divisors is an integer number (17919473208).

Almost surely, 2^71677181021 is an apocalyptic number.

It is an amenable number.

71677181021 is a deficient number, since it is larger than the sum of its proper divisors (711811).

71677181021 is a wasteful number, since it uses less digits than its factorization.

71677181021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711810.

The product of its (nonzero) digits is 32928, while the sum is 41.

The spelling of 71677181021 in words is "seventy-one billion, six hundred seventy-seven million, one hundred eighty-one thousand, twenty-one".