163785281572 has 12 divisors (see below), whose sum is σ = 312680992176. Its totient is φ = 74447855240.

The previous prime is 163785281479. The next prime is 163785281633. The reversal of 163785281572 is 275182587361.

It is a happy number.

163785281572 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1861196338 + ... + 1861196425.

It is an arithmetic number, because the mean of its divisors is an integer number (26056749348).

Almost surely, 2^163785281572 is an apocalyptic number.

It is an amenable number.

163785281572 is a deficient number, since it is larger than the sum of its proper divisors (148895710604).

163785281572 is a wasteful number, since it uses less digits than its factorization.

163785281572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3722392778 (or 3722392776 counting only the distinct ones).

The product of its digits is 5644800, while the sum is 55.

The spelling of 163785281572 in words is "one hundred sixty-three billion, seven hundred eighty-five million, two hundred eighty-one thousand, five hundred seventy-two".