44142768661 has 4 divisors (see below), whose sum is σ = 44547748300. Its totient is φ = 43737789024.

The previous prime is 44142768629. The next prime is 44142768671. The reversal of 44142768661 is 16686724144.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32867514436 + 11275254225 = 181294^2 + 106185^2 .

It is a cyclic number.

It is not a de Polignac number, because 44142768661 - 2⁵ = 44142768629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44142768671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202489656 + ... + 202489873.

It is an arithmetic number, because the mean of its divisors is an integer number (11136937075).

Almost surely, 2^44142768661 is an apocalyptic number.

It is an amenable number.

44142768661 is a deficient number, since it is larger than the sum of its proper divisors (404979639).

44142768661 is a wasteful number, since it uses less digits than its factorization.

44142768661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404979638.

The product of its digits is 1548288, while the sum is 49.

The spelling of 44142768661 in words is "forty-four billion, one hundred forty-two million, seven hundred sixty-eight thousand, six hundred sixty-one".