61281545424 has 80 divisors (see below), whose sum is σ = 181792174080. Its totient is φ = 17592785280.

The previous prime is 61281545389. The next prime is 61281545497. The reversal of 61281545424 is 42454518216.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3044272 + ... + 3064335.

It is an arithmetic number, because the mean of its divisors is an integer number (2272402176).

Almost surely, 2^61281545424 is an apocalyptic number.

It is an amenable number.

61281545424 is an abundant number, since it is smaller than the sum of its proper divisors (120510628656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61281545424 is a wasteful number, since it uses less digits than its factorization.

61281545424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6108648 (or 6108642 counting only the distinct ones).

The product of its digits is 307200, while the sum is 42.

The spelling of 61281545424 in words is "sixty-one billion, two hundred eighty-one million, five hundred forty-five thousand, four hundred twenty-four".