381666175645 has 16 divisors (see below), whose sum is σ = 484891395840. Its totient is φ = 287590734144.

The previous prime is 381666175613. The next prime is 381666175679. The reversal of 381666175645 is 546571666183.

It is a cyclic number.

It is not a de Polignac number, because 381666175645 - 2⁵ = 381666175613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 381666175645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11594949 + ... + 11627818.

It is an arithmetic number, because the mean of its divisors is an integer number (30305712240).

Almost surely, 2^381666175645 is an apocalyptic number.

It is an amenable number.

381666175645 is a deficient number, since it is larger than the sum of its proper divisors (103225220195).

381666175645 is a wasteful number, since it uses less digits than its factorization.

381666175645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23222964.

The product of its digits is 21772800, while the sum is 58.

The spelling of 381666175645 in words is "three hundred eighty-one billion, six hundred sixty-six million, one hundred seventy-five thousand, six hundred forty-five".