16643647452 has 24 divisors (see below), whose sum is σ = 39567918096. Its totient is φ = 5443205248.

The previous prime is 16643647409. The next prime is 16643647453. The reversal of 16643647452 is 25474634661.

It is a super-2 number, since 2×16643647452² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16643647453) 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, 13083993 + ... + 13085264.

It is an arithmetic number, because the mean of its divisors is an integer number (1648663254).

Almost surely, 2^16643647452 is an apocalyptic number.

16643647452 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

16643647452 is an abundant number, since it is smaller than the sum of its proper divisors (22924270644).

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

16643647452 is a wasteful number, since it uses less digits than its factorization.

16643647452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26169317 (or 26169315 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 48.

The spelling of 16643647452 in words is "sixteen billion, six hundred forty-three million, six hundred forty-seven thousand, four hundred fifty-two".