55640825856 has 784 divisors, whose sum is σ = 209722321728. Its totient is φ = 14452162560.

The previous prime is 55640825827. The next prime is 55640825897. The reversal of 55640825856 is 65852804655.

It is a happy number.

55640825856 is a `hidden beast` number, since 5 + 56 + 4 + 0 + 8 + 2 + 585 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 5058256891 + ... + 5058256901.

Almost surely, 2^55640825856 is an apocalyptic number.

55640825856 is a gapful number since it is divisible by the number (56) 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 55640825856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104861160864).

55640825856 is an abundant number, since it is smaller than the sum of its proper divisors (154081495872).

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

55640825856 is an frugal number, since it uses more digits than its factorization.

55640825856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84 (or 23 counting only the distinct ones).

The product of its (nonzero) digits is 11520000, while the sum is 54.

The spelling of 55640825856 in words is "fifty-five billion, six hundred forty million, eight hundred twenty-five thousand, eight hundred fifty-six".