40644124641 has 6 divisors (see below), whose sum is σ = 58708180050. Its totient is φ = 27096083088.

The previous prime is 40644124639. The next prime is 40644124673. The reversal of 40644124641 is 14642144604.

40644124641 is a `hidden beast` number, since 4 + 0 + 6 + 4 + 4 + 1 + 2 + 4 + 641 = 666.

It can be written as a sum of positive squares in only one way, i.e., 40106070225 + 538054416 = 200265^2 + 23196^2 .

It is not a de Polignac number, because 40644124641 - 2¹ = 40644124639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40644124596 and 40644124605.

It is not an unprimeable number, because it can be changed into a prime (40644124601) 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 5 ways as a sum of consecutive naturals, for example, 2258006916 + ... + 2258006933.

It is an arithmetic number, because the mean of its divisors is an integer number (9784696675).

Almost surely, 2^40644124641 is an apocalyptic number.

It is an amenable number.

40644124641 is a deficient number, since it is larger than the sum of its proper divisors (18064055409).

40644124641 is a wasteful number, since it uses less digits than its factorization.

40644124641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4516013855 (or 4516013852 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 36.

The spelling of 40644124641 in words is "forty billion, six hundred forty-four million, one hundred twenty-four thousand, six hundred forty-one".