61631240444 has 24 divisors (see below), whose sum is σ = 109657023168. Its totient is φ = 30300978240.

The previous prime is 61631240393. The next prime is 61631240459. The reversal of 61631240444 is 44404213616.

It is a super-2 number, since 2×61631240444² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 777914 + ... + 853470.

It is an arithmetic number, because the mean of its divisors is an integer number (4569042632).

Almost surely, 2^61631240444 is an apocalyptic number.

It is an amenable number.

61631240444 is a deficient number, since it is larger than the sum of its proper divisors (48025782724).

61631240444 is a wasteful number, since it uses less digits than its factorization.

61631240444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78965 (or 78963 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 35.

The spelling of 61631240444 in words is "sixty-one billion, six hundred thirty-one million, two hundred forty thousand, four hundred forty-four".