445745642427661 has 8 divisors (see below), whose sum is σ = 446506515192600. Its totient is φ = 444985071905088.

The previous prime is 445745642427601. The next prime is 445745642427671. The reversal of 445745642427661 is 166724246547544.

It can be written as a sum of positive squares in 4 ways, for example, as 433538235339561 + 12207407088100 = 20821581^2 + 3493910^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 445745642427661 - 2²¹ = 445745640330509 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 (445745642427601) 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, 72608386 + ... + 78507763.

It is an arithmetic number, because the mean of its divisors is an integer number (55813314399075).

Almost surely, 2^{445745642427661} is an apocalyptic number.

It is an amenable number.

445745642427661 is a deficient number, since it is larger than the sum of its proper divisors (760872764939).

445745642427661 is a wasteful number, since it uses less digits than its factorization.

445745642427661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151121183.

The product of its digits is 1083801600, while the sum is 67.

The spelling of 445745642427661 in words is "four hundred forty-five trillion, seven hundred forty-five billion, six hundred forty-two million, four hundred twenty-seven thousand, six hundred sixty-one".