166420530021636 has 144 divisors (see below), whose sum is σ = 482525642446848. Its totient is φ = 47869606699200.

The previous prime is 166420530021623. The next prime is 166420530021637. The reversal of 166420530021636 is 636120035024661.

166420530021636 is a `hidden beast` number, since 1 + 6 + 6 + 4 + 2 + 0 + 5 + 3 + 0 + 0 + 2 + 1 + 636 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 166420530021591 and 166420530021600.

It is not an unprimeable number, because it can be changed into a prime (166420530021637) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 68546956 + ... + 70933251.

It is an arithmetic number, because the mean of its divisors is an integer number (3350872516992).

Almost surely, 2^{166420530021636} is an apocalyptic number.

It is an amenable number.

166420530021636 is an abundant number, since it is smaller than the sum of its proper divisors (316105112425212).

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

166420530021636 is a wasteful number, since it uses less digits than its factorization.

166420530021636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139480382 (or 139480377 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 45.

The spelling of 166420530021636 in words is "one hundred sixty-six trillion, four hundred twenty billion, five hundred thirty million, twenty-one thousand, six hundred thirty-six".