381450661571 has 12 divisors (see below), whose sum is σ = 467082443880. Its totient is φ = 309749408640.

The previous prime is 381450661567. The next prime is 381450661583. The reversal of 381450661571 is 175166054183.

It is a happy number.

It is not a de Polignac number, because 381450661571 - 2² = 381450661567 is a prime.

It is not an unprimeable number, because it can be changed into a prime (381450661561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 204859790 + ... + 204861651.

It is an arithmetic number, because the mean of its divisors is an integer number (38923536990).

Almost surely, 2^381450661571 is an apocalyptic number.

381450661571 is a deficient number, since it is larger than the sum of its proper divisors (85631782309).

381450661571 is a wasteful number, since it uses less digits than its factorization.

381450661571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409721474 (or 409721467 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 47.

The spelling of 381450661571 in words is "three hundred eighty-one billion, four hundred fifty million, six hundred sixty-one thousand, five hundred seventy-one".