66400030667 has 4 divisors (see below), whose sum is σ = 66400654080. Its totient is φ = 66399407256.

The previous prime is 66400030639. The next prime is 66400030679. The reversal of 66400030667 is 76603000466.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66400030667 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66400030667.

It is not an unprimeable number, because it can be changed into a prime (66400030967) 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, 107228 + ... + 379865.

It is an arithmetic number, because the mean of its divisors is an integer number (16600163520).

Almost surely, 2^66400030667 is an apocalyptic number.

66400030667 is a deficient number, since it is larger than the sum of its proper divisors (623413).

66400030667 is a wasteful number, since it uses less digits than its factorization.

66400030667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623412.

The product of its (nonzero) digits is 108864, while the sum is 38.

The spelling of 66400030667 in words is "sixty-six billion, four hundred million, thirty thousand, six hundred sixty-seven".