44660791561 has 9 divisors (see below), whose sum is σ = 44902798311. Its totient is φ = 44420085552.

The previous prime is 44660791541. The next prime is 44660791573. The reversal of 44660791561 is 16519706644.

The square root of 44660791561 is 211331.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 9069705225 + 35591086336 = 95235^2 + 188656^2 .

It is not a de Polignac number, because 44660791561 - 2⁷ = 44660791433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (44660791501) 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 8 ways as a sum of consecutive naturals, for example, 49239670 + ... + 49240576.

Almost surely, 2^44660791561 is an apocalyptic number.

44660791561 is the 211331-st square number.

44660791561 is the 105666-th centered octagonal number.

It is an amenable number.

44660791561 is a deficient number, since it is larger than the sum of its proper divisors (242006750).

44660791561 is an frugal number, since it uses more digits than its factorization.

44660791561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2280 (or 1140 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 49.

Multiplying 44660791561 by its sum of digits (49), we get a square (2188378786489 = 1479317²).

The spelling of 44660791561 in words is "forty-four billion, six hundred sixty million, seven hundred ninety-one thousand, five hundred sixty-one".