65543554944 has 1024 divisors, whose sum is σ = 248732467200. Its totient is φ = 16562257920.

The previous prime is 65543554883. The next prime is 65543554969. The reversal of 65543554944 is 44945534556.

65543554944 is a `hidden beast` number, since 6 + 5 + 5 + 43 + 554 + 9 + 44 = 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 127 ways as a sum of consecutive naturals, for example, 675706704 + ... + 675706800.

It is an arithmetic number, because the mean of its divisors is an integer number (242902800).

Almost surely, 2^65543554944 is an apocalyptic number.

65543554944 is a gapful number since it is divisible by the number (64) 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 65543554944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124366233600).

65543554944 is an abundant number, since it is smaller than the sum of its proper divisors (183188912256).

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

65543554944 is a wasteful number, since it uses less digits than its factorization.

65543554944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228 (or 210 counting only the distinct ones).

The product of its digits is 25920000, while the sum is 54.

The spelling of 65543554944 in words is "sixty-five billion, five hundred forty-three million, five hundred fifty-four thousand, nine hundred forty-four".