667221051 has 16 divisors (see below), whose sum is σ = 1017080064. Its totient is φ = 381133344.

The previous prime is 667221019. The next prime is 667221059. The reversal of 667221051 is 150122766.

It is not a de Polignac number, because 667221051 - 2⁵ = 667221019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (667221059) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105001 + ... + 111173.

It is an arithmetic number, because the mean of its divisors is an integer number (63567504).

Almost surely, 2^667221051 is an apocalyptic number.

667221051 is a deficient number, since it is larger than the sum of its proper divisors (349859013).

667221051 is a wasteful number, since it uses less digits than its factorization.

667221051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11330.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 667221051 is about 25830.6223502261. The cubic root of 667221051 is about 873.8225473071.

The spelling of 667221051 in words is "six hundred sixty-seven million, two hundred twenty-one thousand, fifty-one".