667221465 has 16 divisors (see below), whose sum is σ = 1068120000. Its totient is φ = 355662912.

The previous prime is 667221437. The next prime is 667221487. The reversal of 667221465 is 564122766.

It is not a de Polignac number, because 667221465 - 2⁵ = 667221433 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20286 + ... + 41784.

It is an arithmetic number, because the mean of its divisors is an integer number (66757500).

Almost surely, 2^667221465 is an apocalyptic number.

It is an amenable number.

667221465 is a deficient number, since it is larger than the sum of its proper divisors (400898535).

667221465 is a wasteful number, since it uses less digits than its factorization.

667221465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23576.

The product of its digits is 120960, while the sum is 39.

The square root of 667221465 is about 25830.6303639691. The cubic root of 667221465 is about 873.8227280380.

The spelling of 667221465 in words is "six hundred sixty-seven million, two hundred twenty-one thousand, four hundred sixty-five".