281768957145 has 24 divisors (see below), whose sum is σ = 525968721096. Its totient is φ = 138717024768.

The previous prime is 281768957143. The next prime is 281768957159. The reversal of 281768957145 is 541759867182.

281768957145 is a `hidden beast` number, since 2 + 8 + 17 + 6 + 8 + 9 + 571 + 45 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 25258109184 + 256510847961 = 158928^2 + 506469^2 .

It is not a de Polignac number, because 281768957145 - 2¹ = 281768957143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (281768957143) 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 23 ways as a sum of consecutive naturals, for example, 240827584 + ... + 240828753.

It is an arithmetic number, because the mean of its divisors is an integer number (21915363379).

Almost surely, 2^281768957145 is an apocalyptic number.

It is an amenable number.

281768957145 is a deficient number, since it is larger than the sum of its proper divisors (244199763951).

281768957145 is a wasteful number, since it uses less digits than its factorization.

281768957145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481656361 (or 481656358 counting only the distinct ones).

The product of its digits is 33868800, while the sum is 63.

The spelling of 281768957145 in words is "two hundred eighty-one billion, seven hundred sixty-eight million, nine hundred fifty-seven thousand, one hundred forty-five".