28601601666 has 16 divisors (see below), whose sum is σ = 62403494688. Its totient is φ = 8667152000.

The previous prime is 28601601629. The next prime is 28601601667. The reversal of 28601601666 is 66610610682.

It is not an unprimeable number, because it can be changed into a prime (28601601667) 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, 216678735 + ... + 216678866.

It is an arithmetic number, because the mean of its divisors is an integer number (3900218418).

Almost surely, 2^28601601666 is an apocalyptic number.

28601601666 is an abundant number, since it is smaller than the sum of its proper divisors (33801893022).

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

28601601666 is a wasteful number, since it uses less digits than its factorization.

28601601666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433357617.

The product of its (nonzero) digits is 124416, while the sum is 42.

The spelling of 28601601666 in words is "twenty-eight billion, six hundred one million, six hundred one thousand, six hundred sixty-six".