64425871902240 has 144 divisors (see below), whose sum is σ = 232785834299928. Its totient is φ = 16169630588928.

The previous prime is 64425871902221. The next prime is 64425871902283. The reversal of 64425871902240 is 4220917852446.

64425871902240 is a `hidden beast` number, since 6 + 4 + 4 + 2 + 587 + 19 + 0 + 2 + 2 + 40 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 64296470546064 + 129401356176 = 8018508^2 + 359724^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-3 number, since 3×64425871902240³ (a number of 42 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1315863427 + ... + 1315912386.

Almost surely, 2^{64425871902240} is an apocalyptic number.

64425871902240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64425871902240 is an abundant number, since it is smaller than the sum of its proper divisors (168359962397688).

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

64425871902240 is a wasteful number, since it uses less digits than its factorization.

64425871902240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2631775851 (or 2631775840 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 54.

The spelling of 64425871902240 in words is "sixty-four trillion, four hundred twenty-five billion, eight hundred seventy-one million, nine hundred two thousand, two hundred forty".