667437401 has 8 divisors (see below), whose sum is σ = 684637800. Its totient is φ = 650280960.

The previous prime is 667437389. The next prime is 667437403. The reversal of 667437401 is 104734766.

It can be written as a sum of positive squares in 4 ways, for example, as 85470025 + 581967376 = 9245^2 + 24124^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 667437401 - 2²⁶ = 600328537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (667437403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20945 + ... + 42113.

It is an arithmetic number, because the mean of its divisors is an integer number (85579725).

Almost surely, 2^667437401 is an apocalyptic number.

It is an amenable number.

667437401 is a deficient number, since it is larger than the sum of its proper divisors (17200399).

667437401 is a wasteful number, since it uses less digits than its factorization.

667437401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21979.

The product of its (nonzero) digits is 84672, while the sum is 38.

The square root of 667437401 is about 25834.8098696313. The cubic root of 667437401 is about 873.9169843146.

The spelling of 667437401 in words is "six hundred sixty-seven million, four hundred thirty-seven thousand, four hundred one".