16643420762465 has 64 divisors (see below), whose sum is σ = 23173834973184. Its totient is φ = 11239634331648.

The previous prime is 16643420762407. The next prime is 16643420762477. The reversal of 16643420762465 is 56426702434661.

It is a cyclic number.

It is not a de Polignac number, because 16643420762465 - 2⁸ = 16643420762209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16643420762465.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 592552652 + ... + 592580738.

It is an arithmetic number, because the mean of its divisors is an integer number (362091171456).

Almost surely, 2^{16643420762465} is an apocalyptic number.

It is an amenable number.

16643420762465 is a deficient number, since it is larger than the sum of its proper divisors (6530414210719).

16643420762465 is a wasteful number, since it uses less digits than its factorization.

16643420762465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29046.

The product of its (nonzero) digits is 34836480, while the sum is 56.

The spelling of 16643420762465 in words is "sixteen trillion, six hundred forty-three billion, four hundred twenty million, seven hundred sixty-two thousand, four hundred sixty-five".