44721397747845 has 128 divisors (see below), whose sum is σ = 97855354598400. Its totient is φ = 18870789832704.

The previous prime is 44721397747837. The next prime is 44721397747867. The reversal of 44721397747845 is 54874779312744.

44721397747845 is a `hidden beast` number, since 4 + 4 + 7 + 21 + 3 + 97 + 7 + 478 + 45 = 666.

It is not a de Polignac number, because 44721397747845 - 2³ = 44721397747837 is a prime.

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 127 ways as a sum of consecutive naturals, for example, 540117769 + ... + 540200561.

It is an arithmetic number, because the mean of its divisors is an integer number (764494957800).

Almost surely, 2^{44721397747845} is an apocalyptic number.

44721397747845 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

44721397747845 is an abundant number, since it is smaller than the sum of its proper divisors (53133956850555).

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

44721397747845 is a wasteful number, since it uses less digits than its factorization.

44721397747845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126796 (or 126790 counting only the distinct ones).

The product of its digits is 1327656960, while the sum is 72.

The spelling of 44721397747845 in words is "forty-four trillion, seven hundred twenty-one billion, three hundred ninety-seven million, seven hundred forty-seven thousand, eight hundred forty-five".