163645023890 has 24 divisors (see below), whose sum is σ = 301570642188. Its totient is φ = 63935723040.

The previous prime is 163645023887. The next prime is 163645023923. The reversal of 163645023890 is 98320546361.

It can be written as a sum of positive squares in 2 ways, for example, as 158307698641 + 5337325249 = 397879^2 + 73057^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4406741 + ... + 4443720.

Almost surely, 2^163645023890 is an apocalyptic number.

163645023890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

163645023890 is a deficient number, since it is larger than the sum of its proper divisors (137925618298).

163645023890 is an equidigital number, since it uses as much as digits as its factorization.

163645023890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8850554 (or 8850511 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 47.

The spelling of 163645023890 in words is "one hundred sixty-three billion, six hundred forty-five million, twenty-three thousand, eight hundred ninety".