166421553036 has 24 divisors (see below), whose sum is σ = 388325486640. Its totient is φ = 55472632512.

The previous prime is 166421553013. The next prime is 166421553037. The reversal of 166421553036 is 630355124661.

It is a super-2 number, since 2×166421553036² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166421553037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 544150 + ... + 793058.

It is an arithmetic number, because the mean of its divisors is an integer number (16180228610).

Almost surely, 2^166421553036 is an apocalyptic number.

It is an amenable number.

166421553036 is an abundant number, since it is smaller than the sum of its proper divisors (221903933604).

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

166421553036 is a wasteful number, since it uses less digits than its factorization.

166421553036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304633 (or 304631 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 42.

Adding to 166421553036 its reverse (630355124661), we get a palindrome (796776677697).

The spelling of 166421553036 in words is "one hundred sixty-six billion, four hundred twenty-one million, five hundred fifty-three thousand, thirty-six".