61771314173221 has 4 divisors (see below), whose sum is σ = 61771419594112. Its totient is φ = 61771208752332.

The previous prime is 61771314173203. The next prime is 61771314173237. The reversal of 61771314173221 is 12237141317716.

It is a happy number.

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 61771314173221 - 2¹¹ = 61771314171173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61771314173021) 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, 51826581 + ... + 53005066.

It is an arithmetic number, because the mean of its divisors is an integer number (15442854898528).

Almost surely, 2^{61771314173221} is an apocalyptic number.

It is an amenable number.

61771314173221 is a deficient number, since it is larger than the sum of its proper divisors (105420891).

61771314173221 is a wasteful number, since it uses less digits than its factorization.

61771314173221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105420890.

The product of its digits is 296352, while the sum is 46.

The spelling of 61771314173221 in words is "sixty-one trillion, seven hundred seventy-one billion, three hundred fourteen million, one hundred seventy-three thousand, two hundred twenty-one".