16344477643 has 16 divisors (see below), whose sum is σ = 18089046976. Its totient is φ = 14670046080.

The previous prime is 16344477631. The next prime is 16344477659. The reversal of 16344477643 is 34677444361.

It is a cyclic number.

It is not a de Polignac number, because 16344477643 - 2¹³ = 16344469451 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16344477623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 804298 + ... + 824368.

It is an arithmetic number, because the mean of its divisors is an integer number (1130565436).

Almost surely, 2^16344477643 is an apocalyptic number.

16344477643 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

16344477643 is a deficient number, since it is larger than the sum of its proper divisors (1744569333).

16344477643 is a wasteful number, since it uses less digits than its factorization.

16344477643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21814.

The product of its digits is 4064256, while the sum is 49.

The spelling of 16344477643 in words is "sixteen billion, three hundred forty-four million, four hundred seventy-seven thousand, six hundred forty-three".