64400020531641 has 24 divisors (see below), whose sum is σ = 95022843158880. Its totient is φ = 42019665785856.

The previous prime is 64400020531591. The next prime is 64400020531699. The reversal of 64400020531641 is 14613502000446.

64400020531641 is a `hidden beast` number, since 6 + 4 + 4 + 0 + 0 + 0 + 2 + 0 + 5 + 3 + 1 + 641 = 666.

64400020531641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 64400020531641 - 2⁷ = 64400020531513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64400020531596 and 64400020531605.

It is not an unprimeable number, because it can be changed into a prime (64400020531141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 402777736 + ... + 402937593.

It is an arithmetic number, because the mean of its divisors is an integer number (3959285131620).

Almost surely, 2^{64400020531641} is an apocalyptic number.

It is an amenable number.

64400020531641 is a deficient number, since it is larger than the sum of its proper divisors (30622822627239).

64400020531641 is a wasteful number, since it uses less digits than its factorization.

64400020531641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805715525 (or 805715522 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 64400020531641 in words is "sixty-four trillion, four hundred billion, twenty million, five hundred thirty-one thousand, six hundred forty-one".