163405972090 has 64 divisors (see below), whose sum is σ = 305893905408. Its totient is φ = 62780889600.

The previous prime is 163405972057. The next prime is 163405972091. The reversal of 163405972090 is 90279504361.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 163405972090.

It is not an unprimeable number, because it can be changed into a prime (163405972091) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72079137 + ... + 72081403.

It is an arithmetic number, because the mean of its divisors is an integer number (4779592272).

Almost surely, 2^163405972090 is an apocalyptic number.

163405972090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

163405972090 is a deficient number, since it is larger than the sum of its proper divisors (142487933318).

163405972090 is a wasteful number, since it uses less digits than its factorization.

163405972090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3943.

The product of its (nonzero) digits is 408240, while the sum is 46.

The spelling of 163405972090 in words is "one hundred sixty-three billion, four hundred five million, nine hundred seventy-two thousand, ninety".