55495643840 has 896 divisors, whose sum is σ = 184343040000. Its totient is φ = 15736799232.

The previous prime is 55495643809. The next prime is 55495643843. The reversal of 55495643840 is 4834659455.

It is a happy number.

It is a super-2 number, since 2×55495643840² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55495643843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 623546516 + ... + 623546604.

It is an arithmetic number, because the mean of its divisors is an integer number (205740000).

Almost surely, 2^55495643840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55495643840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92171520000).

55495643840 is an abundant number, since it is smaller than the sum of its proper divisors (128847396160).

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

55495643840 is a wasteful number, since it uses less digits than its factorization.

55495643840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 10368000, while the sum is 53.

The spelling of 55495643840 in words is "fifty-five billion, four hundred ninety-five million, six hundred forty-three thousand, eight hundred forty".