61444411311 has 4 divisors (see below), whose sum is σ = 81925881752. Its totient is φ = 40962940872.

The previous prime is 61444411309. The next prime is 61444411321. The reversal of 61444411311 is 11311444416.

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

It is not a de Polignac number, because 61444411311 - 2¹ = 61444411309 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 (61444411321) 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, 10240735216 + ... + 10240735221.

It is an arithmetic number, because the mean of its divisors is an integer number (20481470438).

Almost surely, 2^61444411311 is an apocalyptic number.

61444411311 is a deficient number, since it is larger than the sum of its proper divisors (20481470441).

61444411311 is a wasteful number, since it uses less digits than its factorization.

61444411311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20481470440.

The product of its digits is 4608, while the sum is 30.

Adding to 61444411311 its reverse (11311444416), we get a palindrome (72755855727).

The spelling of 61444411311 in words is "sixty-one billion, four hundred forty-four million, four hundred eleven thousand, three hundred eleven".