16643368361557 has 16 divisors (see below), whose sum is σ = 19186559720064. Its totient is φ = 14141800296000.

The previous prime is 16643368361551. The next prime is 16643368361567. The reversal of 16643368361557 is 75516386334661.

16643368361557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 16643368361557 - 2²³ = 16643359972949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16643368361551) 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, 8780994 + ... + 10506787.

It is an arithmetic number, because the mean of its divisors is an integer number (1199159982504).

Almost surely, 2^{16643368361557} is an apocalyptic number.

It is an amenable number.

16643368361557 is a deficient number, since it is larger than the sum of its proper divisors (2543191358507).

16643368361557 is a wasteful number, since it uses less digits than its factorization.

16643368361557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19288860.

The product of its digits is 195955200, while the sum is 64.

The spelling of 16643368361557 in words is "sixteen trillion, six hundred forty-three billion, three hundred sixty-eight million, three hundred sixty-one thousand, five hundred fifty-seven".