16218779452 has 24 divisors (see below), whose sum is σ = 29628641952. Its totient is φ = 7753732800.

The previous prime is 16218779443. The next prime is 16218779459. The reversal of 16218779452 is 25497781261.

It is a self number, because there is not a number n which added to its sum of digits gives 16218779452.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16218779459) 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, 207502 + ... + 274762.

It is an arithmetic number, because the mean of its divisors is an integer number (1234526748).

Almost surely, 2^16218779452 is an apocalyptic number.

It is an amenable number.

16218779452 is a deficient number, since it is larger than the sum of its proper divisors (13409862500).

16218779452 is a wasteful number, since it uses less digits than its factorization.

16218779452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69909 (or 69907 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 52.

The spelling of 16218779452 in words is "sixteen billion, two hundred eighteen million, seven hundred seventy-nine thousand, four hundred fifty-two".