665555113110240 has 144 divisors (see below), whose sum is σ = 2369954946367008. Its totient is φ = 169764782466048.

The previous prime is 665555113110203. The next prime is 665555113110241. The reversal of 665555113110240 is 42011311555566.

665555113110240 is a `hidden beast` number, since 6 + 6 + 5 + 55 + 511 + 31 + 10 + 2 + 40 = 666.

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

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665555113110241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10047598419 + ... + 10047664658.

It is an arithmetic number, because the mean of its divisors is an integer number (16458020460882).

Almost surely, 2^{665555113110240} is an apocalyptic number.

665555113110240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

665555113110240 is an abundant number, since it is smaller than the sum of its proper divisors (1704399833256768).

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

665555113110240 is a wasteful number, since it uses less digits than its factorization.

665555113110240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20095263121 (or 20095263110 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 45.

The spelling of 665555113110240 in words is "six hundred sixty-five trillion, five hundred fifty-five billion, one hundred thirteen million, one hundred ten thousand, two hundred forty".