163740236720 has 80 divisors (see below), whose sum is σ = 393207118848. Its totient is φ = 63346133760.

The previous prime is 163740236717. The next prime is 163740236731. The reversal of 163740236720 is 27632047361.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×163740236720² (a number of 23 digits) contains 22 as substring.

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, 4413287 + ... + 4450233.

Almost surely, 2^163740236720 is an apocalyptic number.

163740236720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 163740236720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196603559424).

163740236720 is an abundant number, since it is smaller than the sum of its proper divisors (229466882128).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

163740236720 is a wasteful number, since it uses less digits than its factorization.

163740236720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38778 (or 38772 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 41.

The spelling of 163740236720 in words is "one hundred sixty-three billion, seven hundred forty million, two hundred thirty-six thousand, seven hundred twenty".