163949011521 has 16 divisors (see below), whose sum is σ = 225928593408. Its totient is φ = 105643083600.

The previous prime is 163949011489. The next prime is 163949011531. The reversal of 163949011521 is 125110949361.

It is not a de Polignac number, because 163949011521 - 2⁵ = 163949011489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (163949011531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1011441 + ... + 1162286.

It is an arithmetic number, because the mean of its divisors is an integer number (14120537088).

Almost surely, 2^163949011521 is an apocalyptic number.

It is an amenable number.

163949011521 is a deficient number, since it is larger than the sum of its proper divisors (61979581887).

163949011521 is a wasteful number, since it uses less digits than its factorization.

163949011521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2174572.

The product of its (nonzero) digits is 58320, while the sum is 42.

The spelling of 163949011521 in words is "one hundred sixty-three billion, nine hundred forty-nine million, eleven thousand, five hundred twenty-one".