66667407 has 8 divisors (see below), whose sum is σ = 89013120. Its totient is φ = 44383320.

The previous prime is 66667399. The next prime is 66667423. The reversal of 66667407 is 70476666.

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

It is not a de Polignac number, because 66667407 - 2³ = 66667399 is a prime.

It is a super-2 number, since 2×66667407² = 8889086312207298, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66667457) 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, 12819 + ... + 17252.

It is an arithmetic number, because the mean of its divisors is an integer number (11126640).

Almost surely, 2^66667407 is an apocalyptic number.

66667407 is a deficient number, since it is larger than the sum of its proper divisors (22345713).

66667407 is a wasteful number, since it uses less digits than its factorization.

66667407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30813.

The product of its (nonzero) digits is 254016, while the sum is 42.

The square root of 66667407 is about 8165.0111451241. The cubic root of 66667407 is about 405.4816339850.

The spelling of 66667407 in words is "sixty-six million, six hundred sixty-seven thousand, four hundred seven".