61271455717 has 4 divisors (see below), whose sum is σ = 61272375340. Its totient is φ = 61270536096.

The previous prime is 61271455669. The next prime is 61271455733. The reversal of 61271455717 is 71755417216.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40000400001 + 21271055716 = 200001^2 + 145846^2 .

It is a cyclic number.

It is not a de Polignac number, because 61271455717 - 2³¹ = 59123972069 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 (61271455757) 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, 351342 + ... + 495967.

It is an arithmetic number, because the mean of its divisors is an integer number (15318093835).

Almost surely, 2^61271455717 is an apocalyptic number.

It is an amenable number.

61271455717 is a deficient number, since it is larger than the sum of its proper divisors (919623).

61271455717 is an equidigital number, since it uses as much as digits as its factorization.

61271455717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919622.

The product of its digits is 411600, while the sum is 46.

The spelling of 61271455717 in words is "sixty-one billion, two hundred seventy-one million, four hundred fifty-five thousand, seven hundred seventeen".