3781426616819 has 4 divisors (see below), whose sum is σ = 3788684633880. Its totient is φ = 3774168599760.

The previous prime is 3781426616789. The next prime is 3781426616831. The reversal of 3781426616819 is 9186166241873.

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 3781426616819 - 2⁸ = 3781426616563 is a prime.

It is a super-2 number, since 2×3781426616819² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3781426619819) 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, 3629007749 + ... + 3629008790.

It is an arithmetic number, because the mean of its divisors is an integer number (947171158470).

Almost surely, 2^{3781426616819} is an apocalyptic number.

3781426616819 is a deficient number, since it is larger than the sum of its proper divisors (7258017061).

3781426616819 is an equidigital number, since it uses as much as digits as its factorization.

3781426616819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7258017060.

The product of its digits is 20901888, while the sum is 62.

The spelling of 3781426616819 in words is "three trillion, seven hundred eighty-one billion, four hundred twenty-six million, six hundred sixteen thousand, eight hundred nineteen".