667551550 has 12 divisors (see below), whose sum is σ = 1241645976. Its totient is φ = 267020600.

The previous prime is 667551523. The next prime is 667551553. The reversal of 667551550 is 55155766.

667551550 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667551553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6675466 + ... + 6675565.

It is an arithmetic number, because the mean of its divisors is an integer number (103470498).

Almost surely, 2^667551550 is an apocalyptic number.

667551550 is a deficient number, since it is larger than the sum of its proper divisors (574094426).

667551550 is a wasteful number, since it uses less digits than its factorization.

667551550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13351043 (or 13351038 counting only the distinct ones).

The product of its (nonzero) digits is 157500, while the sum is 40.

The square root of 667551550 is about 25837.0189843952. The cubic root of 667551550 is about 873.9668022517.

The spelling of 667551550 in words is "six hundred sixty-seven million, five hundred fifty-one thousand, five hundred fifty".