8551406778 has 8 divisors (see below), whose sum is σ = 17102813568. Its totient is φ = 2850468924.

The previous prime is 8551406767. The next prime is 8551406821. The reversal of 8551406778 is 8776041558.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

8551406778 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 8551406778.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 712617226 + ... + 712617237.

It is an arithmetic number, because the mean of its divisors is an integer number (2137851696).

Almost surely, 2^8551406778 is an apocalyptic number.

8551406778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

8551406778 is a wasteful number, since it uses less digits than its factorization.

8551406778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1425234468.

The product of its (nonzero) digits is 1881600, while the sum is 51.

The square root of 8551406778 is about 92473.8167158683. The cubic root of 8551406778 is about 2044.9334952059.

The spelling of 8551406778 in words is "eight billion, five hundred fifty-one million, four hundred six thousand, seven hundred seventy-eight".