64540496643 has 16 divisors (see below), whose sum is σ = 101738714880. Its totient is φ = 35608549536.

The previous prime is 64540496611. The next prime is 64540496663. The reversal of 64540496643 is 34669404546.

64540496643 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 64540496643 - 2⁵ = 64540496611 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64540496663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52988305 + ... + 52989522.

It is an arithmetic number, because the mean of its divisors is an integer number (6358669680).

Almost surely, 2^64540496643 is an apocalyptic number.

64540496643 is a deficient number, since it is larger than the sum of its proper divisors (37198218237).

64540496643 is a wasteful number, since it uses less digits than its factorization.

64540496643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105977866.

The product of its (nonzero) digits is 7464960, while the sum is 51.

The spelling of 64540496643 in words is "sixty-four billion, five hundred forty million, four hundred ninety-six thousand, six hundred forty-three".