66387478307 has 4 divisors (see below), whose sum is σ = 66622063320. Its totient is φ = 66152893296.

The previous prime is 66387478301. The next prime is 66387478319. The reversal of 66387478307 is 70387478366.

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

It is a cyclic number.

It is not a de Polignac number, because 66387478307 - 2⁴ = 66387478291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66387478301) 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, 117292082 + ... + 117292647.

It is an arithmetic number, because the mean of its divisors is an integer number (16655515830).

Almost surely, 2^66387478307 is an apocalyptic number.

66387478307 is a deficient number, since it is larger than the sum of its proper divisors (234585013).

66387478307 is a wasteful number, since it uses less digits than its factorization.

66387478307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234585012.

The product of its (nonzero) digits is 28449792, while the sum is 59.

Adding to 66387478307 its sum of digits (59), we get a palindrome (66387478366).

The spelling of 66387478307 in words is "sixty-six billion, three hundred eighty-seven million, four hundred seventy-eight thousand, three hundred seven".