6668377387 has 4 divisors (see below), whose sum is σ = 7621002736. Its totient is φ = 5715752040.

The previous prime is 6668377367. The next prime is 6668377453. The reversal of 6668377387 is 7837738666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7837738666 = 2 ⋅3918869333.

It is a cyclic number.

It is not a de Polignac number, because 6668377387 - 2⁷ = 6668377259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6668377367) 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, 476312664 + ... + 476312677.

It is an arithmetic number, because the mean of its divisors is an integer number (1905250684).

Almost surely, 2^6668377387 is an apocalyptic number.

6668377387 is the 47147-th hex number.

6668377387 is a deficient number, since it is larger than the sum of its proper divisors (952625349).

6668377387 is an equidigital number, since it uses as much as digits as its factorization.

6668377387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952625348.

The product of its digits is 42674688, while the sum is 61.

The square root of 6668377387 is about 81660.1334005768. The cubic root of 6668377387 is about 1882.2330289409.

The spelling of 6668377387 in words is "six billion, six hundred sixty-eight million, three hundred seventy-seven thousand, three hundred eighty-seven".