667478550 has 48 divisors (see below), whose sum is σ = 1742477760. Its totient is φ = 168625440.

The previous prime is 667478549. The next prime is 667478563. The reversal of 667478550 is 55874766.

667478550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×667478550² = 891055229420205000, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 667478550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 114252 + ... + 119951.

It is an arithmetic number, because the mean of its divisors is an integer number (36301620).

Almost surely, 2^667478550 is an apocalyptic number.

667478550 is an abundant number, since it is smaller than the sum of its proper divisors (1074999210).

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

667478550 is a wasteful number, since it uses less digits than its factorization.

667478550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234237 (or 234232 counting only the distinct ones).

The product of its (nonzero) digits is 1411200, while the sum is 48.

The square root of 667478550 is about 25835.6062440965. The cubic root of 667478550 is about 873.9349435873.

The spelling of 667478550 in words is "six hundred sixty-seven million, four hundred seventy-eight thousand, five hundred fifty".