66437667 has 6 divisors (see below), whose sum is σ = 95965532. Its totient is φ = 44291772.

The previous prime is 66437663. The next prime is 66437677. The reversal of 66437667 is 76673466.

It is not a de Polignac number, because 66437667 - 2² = 66437663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66437663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3690973 + ... + 3690990.

Almost surely, 2^66437667 is an apocalyptic number.

66437667 is a deficient number, since it is larger than the sum of its proper divisors (29527865).

66437667 is a wasteful number, since it uses less digits than its factorization.

66437667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7381969 (or 7381966 counting only the distinct ones).

The product of its digits is 762048, while the sum is 45.

The square root of 66437667 is about 8150.9304376862. The cubic root of 66437667 is about 405.0153263519.

The spelling of 66437667 in words is "sixty-six million, four hundred thirty-seven thousand, six hundred sixty-seven".