64908543617040 has 40 divisors (see below), whose sum is σ = 201216485213568. Its totient is φ = 17308944964480.

The previous prime is 64908543617039. The next prime is 64908543617063. The reversal of 64908543617040 is 4071634580946.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135226132296 + ... + 135226132775.

Almost surely, 2^{64908543617040} is an apocalyptic number.

64908543617040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64908543617040 is an abundant number, since it is smaller than the sum of its proper divisors (136307941596528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64908543617040 is a wasteful number, since it uses less digits than its factorization.

64908543617040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270452265087 (or 270452265081 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 57.

The spelling of 64908543617040 in words is "sixty-four trillion, nine hundred eight billion, five hundred forty-three million, six hundred seventeen thousand, forty".