64240240646640 has 80 divisors (see below), whose sum is σ = 199175094442368. Its totient is φ = 17128120220928.

The previous prime is 64240240646507. The next prime is 64240240646677. The reversal of 64240240646640 is 4664604204246.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 64240240646640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18817054 + ... + 21967293.

Almost surely, 2^{64240240646640} is an apocalyptic number.

64240240646640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64240240646640 is an abundant number, since it is smaller than the sum of its proper divisors (134934853795728).

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

64240240646640 is a wasteful number, since it uses less digits than its factorization.

64240240646640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40790926 (or 40790920 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 48.

The spelling of 64240240646640 in words is "sixty-four trillion, two hundred forty billion, two hundred forty million, six hundred forty-six thousand, six hundred forty".