44561787981 has 8 divisors (see below), whose sum is σ = 59425157184. Its totient is φ = 29703138720.

The previous prime is 44561787973. The next prime is 44561788001. The reversal of 44561787981 is 18978716544.

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

It is not a de Polignac number, because 44561787981 - 2³ = 44561787973 is a prime.

It is a super-2 number, since 2×44561787981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44561787911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1157896 + ... + 1195761.

It is an arithmetic number, because the mean of its divisors is an integer number (7428144648).

Almost surely, 2^44561787981 is an apocalyptic number.

It is an amenable number.

44561787981 is a deficient number, since it is larger than the sum of its proper divisors (14863369203).

44561787981 is a wasteful number, since it uses less digits than its factorization.

44561787981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2359971.

The product of its digits is 13547520, while the sum is 60.

The spelling of 44561787981 in words is "forty-four billion, five hundred sixty-one million, seven hundred eighty-seven thousand, nine hundred eighty-one".