44782778081 has 8 divisors (see below), whose sum is σ = 45774465984. Its totient is φ = 43796524720.

The previous prime is 44782778021. The next prime is 44782778177. The reversal of 44782778081 is 18087728744.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-44782778081 is a prime.

It is a super-2 number, since 2×44782778081² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (44782778021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1341971 + ... + 1374936.

It is an arithmetic number, because the mean of its divisors is an integer number (5721808248).

Almost surely, 2^44782778081 is an apocalyptic number.

It is an amenable number.

44782778081 is a deficient number, since it is larger than the sum of its proper divisors (991687903).

44782778081 is a wasteful number, since it uses less digits than its factorization.

44782778081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2717271.

The product of its (nonzero) digits is 5619712, while the sum is 56.

The spelling of 44782778081 in words is "forty-four billion, seven hundred eighty-two million, seven hundred seventy-eight thousand, eighty-one".