381821471779 has 16 divisors (see below), whose sum is σ = 424563984000. Its totient is φ = 340462013760.

The previous prime is 381821471777. The next prime is 381821471783. The reversal of 381821471779 is 977174128183.

It is not a de Polignac number, because 381821471779 - 2¹ = 381821471777 is a prime.

It is a super-2 number, since 2×381821471779² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381821471777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 940029 + ... + 1283470.

It is an arithmetic number, because the mean of its divisors is an integer number (26535249000).

Almost surely, 2^381821471779 is an apocalyptic number.

381821471779 is a deficient number, since it is larger than the sum of its proper divisors (42742512221).

381821471779 is a wasteful number, since it uses less digits than its factorization.

381821471779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2223810.

The product of its digits is 4741632, while the sum is 58.

The spelling of 381821471779 in words is "three hundred eighty-one billion, eight hundred twenty-one million, four hundred seventy-one thousand, seven hundred seventy-nine".