667444401 has 16 divisors (see below), whose sum is σ = 1064869120. Its totient is φ = 410734800.

The previous prime is 667444399. The next prime is 667444433. The reversal of 667444401 is 104444766.

It is not a de Polignac number, because 667444401 - 2¹ = 667444399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667444201) 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, 950425 + ... + 951126.

It is an arithmetic number, because the mean of its divisors is an integer number (66554320).

Almost surely, 2^667444401 is an apocalyptic number.

It is an amenable number.

667444401 is a deficient number, since it is larger than the sum of its proper divisors (397424719).

667444401 is a wasteful number, since it uses less digits than its factorization.

667444401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1901573 (or 1901567 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 36.

The square root of 667444401 is about 25834.9453454038. The cubic root of 667444401 is about 873.9200394812.

The spelling of 667444401 in words is "six hundred sixty-seven million, four hundred forty-four thousand, four hundred one".