4551643278 has 96 divisors (see below), whose sum is σ = 12396174336. Its totient is φ = 1174872384.

The previous prime is 4551643273. The next prime is 4551643301. The reversal of 4551643278 is 8723461554.

4551643278 is a `hidden beast` number, since 4 + 551 + 64 + 32 + 7 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4551643273) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 47425 + ... + 106547.

It is an arithmetic number, because the mean of its divisors is an integer number (129126816).

Almost surely, 2^4551643278 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4551643278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6198087168).

4551643278 is an abundant number, since it is smaller than the sum of its proper divisors (7844531058).

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

4551643278 is a wasteful number, since it uses less digits than its factorization.

4551643278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59198 (or 59195 counting only the distinct ones).

The product of its digits is 806400, while the sum is 45.

The square root of 4551643278 is about 67465.8675035014. The cubic root of 4551643278 is about 1657.2552597565.

The spelling of 4551643278 in words is "four billion, five hundred fifty-one million, six hundred forty-three thousand, two hundred seventy-eight".