381166322651 has 2 divisors, whose sum is σ = 381166322652. Its totient is φ = 381166322650.

The previous prime is 381166322617. The next prime is 381166322707. The reversal of 381166322651 is 156223661183.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 381166322651 - 2⁶ = 381166322587 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (381166322351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190583161325 + 190583161326.

It is an arithmetic number, because the mean of its divisors is an integer number (190583161326).

Almost surely, 2^381166322651 is an apocalyptic number.

381166322651 is a deficient number, since it is larger than the sum of its proper divisors (1).

381166322651 is an equidigital number, since it uses as much as digits as its factorization.

381166322651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 44.

The spelling of 381166322651 in words is "three hundred eighty-one billion, one hundred sixty-six million, three hundred twenty-two thousand, six hundred fifty-one".