16643764874879 has 2 divisors, whose sum is σ = 16643764874880. Its totient is φ = 16643764874878.

The previous prime is 16643764874827. The next prime is 16643764874939. The reversal of 16643764874879 is 97847846734661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16643764874879 - 2²⁴ = 16643748097663 is a prime.

It is a super-4 number, since 4×16643764874879⁴ (a number of 54 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16643764874809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8321882437439 + 8321882437440.

It is an arithmetic number, because the mean of its divisors is an integer number (8321882437440).

Almost surely, 2^{16643764874879} is an apocalyptic number.

16643764874879 is a deficient number, since it is larger than the sum of its proper divisors (1).

16643764874879 is an equidigital number, since it uses as much as digits as its factorization.

16643764874879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8193540096, while the sum is 80.

The spelling of 16643764874879 in words is "sixteen trillion, six hundred forty-three billion, seven hundred sixty-four million, eight hundred seventy-four thousand, eight hundred seventy-nine".