6553667778 has 96 divisors (see below), whose sum is σ = 15790878720. Its totient is φ = 1806124320.

The previous prime is 6553667761. The next prime is 6553667789. The reversal of 6553667778 is 8777663556.

It is a super-2 number, since 2×6553667778² = 85901122688790914568, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3270925 + ... + 3272927.

It is an arithmetic number, because the mean of its divisors is an integer number (164488320).

Almost surely, 2^6553667778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6553667778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7895439360).

6553667778 is an abundant number, since it is smaller than the sum of its proper divisors (9237210942).

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

6553667778 is a wasteful number, since it uses less digits than its factorization.

6553667778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2412 (or 2405 counting only the distinct ones).

The product of its digits is 44452800, while the sum is 60.

The square root of 6553667778 is about 80954.7267180861. The cubic root of 6553667778 is about 1871.3778037385.

The spelling of 6553667778 in words is "six billion, five hundred fifty-three million, six hundred sixty-seven thousand, seven hundred seventy-eight".