655440906240 has 1152 divisors, whose sum is σ = 2524207795200. Its totient is φ = 162756034560.

The previous prime is 655440906233. The next prime is 655440906299. The reversal of 655440906240 is 42609044556.

655440906240 is a `hidden beast` number, since 6 + 5 + 544 + 0 + 9 + 0 + 62 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (1152).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2236999534 + ... + 2236999826.

It is an arithmetic number, because the mean of its divisors is an integer number (2191152600).

Almost surely, 2^655440906240 is an apocalyptic number.

655440906240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 655440906240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1262103897600).

655440906240 is an abundant number, since it is smaller than the sum of its proper divisors (1868766888960).

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

655440906240 is a wasteful number, since it uses less digits than its factorization.

655440906240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395 (or 363 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 45.

The spelling of 655440906240 in words is "six hundred fifty-five billion, four hundred forty million, nine hundred six thousand, two hundred forty".