381661313427 has 36 divisors (see below), whose sum is σ = 597644402264. Its totient is φ = 243378146880.

The previous prime is 381661313399. The next prime is 381661313477. The reversal of 381661313427 is 724313166183.

381661313427 is a `hidden beast` number, since 3 + 8 + 1 + 6 + 613 + 1 + 3 + 4 + 27 = 666.

It is not a de Polignac number, because 381661313427 - 2¹² = 381661309331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381661313477) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1355974 + ... + 1613067.

Almost surely, 2^381661313427 is an apocalyptic number.

381661313427 is a deficient number, since it is larger than the sum of its proper divisors (215983088837).

381661313427 is an equidigital number, since it uses as much as digits as its factorization.

381661313427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2969102 (or 2969067 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The spelling of 381661313427 in words is "three hundred eighty-one billion, six hundred sixty-one million, three hundred thirteen thousand, four hundred twenty-seven".