61215992444 has 24 divisors (see below), whose sum is σ = 114017375808. Its totient is φ = 28658257920.

The previous prime is 61215992437. The next prime is 61215992449. The reversal of 61215992444 is 44429951216.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61215992449) by changing a digit.

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, 2319092 + ... + 2345339.

It is an arithmetic number, because the mean of its divisors is an integer number (4750723992).

Almost surely, 2^61215992444 is an apocalyptic number.

It is an amenable number.

61215992444 is a deficient number, since it is larger than the sum of its proper divisors (52801383364).

61215992444 is a wasteful number, since it uses less digits than its factorization.

61215992444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4664645 (or 4664643 counting only the distinct ones).

The product of its digits is 622080, while the sum is 47.

The spelling of 61215992444 in words is "sixty-one billion, two hundred fifteen million, nine hundred ninety-two thousand, four hundred forty-four".