16564186020 has 96 divisors (see below), whose sum is σ = 47103743232. Its totient is φ = 4348666368.

The previous prime is 16564185973. The next prime is 16564186027. The reversal of 16564186020 is 2068146561.

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 16564186020.

It is not an unprimeable number, because it can be changed into a prime (16564186027) 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, 1061394 + ... + 1076886.

It is an arithmetic number, because the mean of its divisors is an integer number (490663992).

Almost surely, 2^16564186020 is an apocalyptic number.

16564186020 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 16564186020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23551871616).

16564186020 is an abundant number, since it is smaller than the sum of its proper divisors (30539557212).

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

16564186020 is a wasteful number, since it uses less digits than its factorization.

16564186020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15781 (or 15779 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The spelling of 16564186020 in words is "sixteen billion, five hundred sixty-four million, one hundred eighty-six thousand, twenty".