4069387778891 has 8 divisors (see below), whose sum is σ = 4125196851600. Its totient is φ = 4013580436992.

The previous prime is 4069387778887. The next prime is 4069387778923. The reversal of 4069387778891 is 1988777839604.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4069387778891 - 2² = 4069387778887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4069387778851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4719611 + ... + 5514843.

It is an arithmetic number, because the mean of its divisors is an integer number (515649606450).

Almost surely, 2^{4069387778891} is an apocalyptic number.

4069387778891 is a deficient number, since it is larger than the sum of its proper divisors (55809072709).

4069387778891 is an equidigital number, since it uses as much as digits as its factorization.

4069387778891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865405.

The product of its (nonzero) digits is 1024192512, while the sum is 77.

The spelling of 4069387778891 in words is "four trillion, sixty-nine billion, three hundred eighty-seven million, seven hundred seventy-eight thousand, eight hundred ninety-one".