61144303326881 has 4 divisors (see below), whose sum is σ = 61157432879172. Its totient is φ = 61131173774592.

The previous prime is 61144303326863. The next prime is 61144303326893. The reversal of 61144303326881 is 18862330344116.

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 37708392992656 + 23435910334225 = 6140716^2 + 4841065^2 .

It is a cyclic number.

It is not a de Polignac number, because 61144303326881 - 2²² = 61144299132577 is a prime.

It is a super-2 number, since 2×61144303326881² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61144303325881) 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, 6564769160 + ... + 6564778473.

It is an arithmetic number, because the mean of its divisors is an integer number (15289358219793).

Almost surely, 2^{61144303326881} is an apocalyptic number.

It is an amenable number.

61144303326881 is a deficient number, since it is larger than the sum of its proper divisors (13129552291).

61144303326881 is a wasteful number, since it uses less digits than its factorization.

61144303326881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13129552290.

The product of its (nonzero) digits is 1990656, while the sum is 50.

The spelling of 61144303326881 in words is "sixty-one trillion, one hundred forty-four billion, three hundred three million, three hundred twenty-six thousand, eight hundred eighty-one".