66737667 has 4 divisors (see below), whose sum is σ = 88983560. Its totient is φ = 44491776.

The previous prime is 66737647. The next prime is 66737681. The reversal of 66737667 is 76673766.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 66737667 - 2¹⁸ = 66475523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66737617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11122942 + ... + 11122947.

It is an arithmetic number, because the mean of its divisors is an integer number (22245890).

Almost surely, 2^66737667 is an apocalyptic number.

66737667 is a deficient number, since it is larger than the sum of its proper divisors (22245893).

66737667 is a wasteful number, since it uses less digits than its factorization.

66737667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22245892.

The product of its digits is 1333584, while the sum is 48.

The square root of 66737667 is about 8169.3125169747. The cubic root of 66737667 is about 405.6240280904.

The spelling of 66737667 in words is "sixty-six million, seven hundred thirty-seven thousand, six hundred sixty-seven".