445640426649 has 16 divisors (see below), whose sum is σ = 720226952640. Its totient is φ = 270085106880.

The previous prime is 445640426639. The next prime is 445640426657. The reversal of 445640426649 is 946624046544.

445640426649 is a `hidden beast` number, since 445 + 64 + 0 + 42 + 66 + 49 = 666.

It is not a de Polignac number, because 445640426649 - 2²⁰ = 445639378073 is a prime.

It is a super-3 number, since 3×445640426649³ (a number of 36 digits) contains 333 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 445640426595 and 445640426604.

It is not an unprimeable number, because it can be changed into a prime (445640426639) 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 15 ways as a sum of consecutive naturals, for example, 750236112 + ... + 750236705.

It is an arithmetic number, because the mean of its divisors is an integer number (45014184540).

Almost surely, 2^445640426649 is an apocalyptic number.

It is an amenable number.

445640426649 is a deficient number, since it is larger than the sum of its proper divisors (274586525991).

445640426649 is a wasteful number, since it uses less digits than its factorization.

445640426649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500472837 (or 1500472831 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 54.

The spelling of 445640426649 in words is "four hundred forty-five billion, six hundred forty million, four hundred twenty-six thousand, six hundred forty-nine".