16210977671989 has 2 divisors, whose sum is σ = 16210977671990. Its totient is φ = 16210977671988.

The previous prime is 16210977671981. The next prime is 16210977672053. The reversal of 16210977671989 is 98917677901261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11642883635889 + 4568094036100 = 3412167^2 + 2137310^2 .

It is a cyclic number.

It is not a de Polignac number, because 16210977671989 - 2³ = 16210977671981 is a prime.

It is a super-2 number, since 2×16210977671989² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16210977671981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8105488835994 + 8105488835995.

It is an arithmetic number, because the mean of its divisors is an integer number (8105488835995).

Almost surely, 2^{16210977671989} is an apocalyptic number.

It is an amenable number.

16210977671989 is a deficient number, since it is larger than the sum of its proper divisors (1).

16210977671989 is an equidigital number, since it uses as much as digits as its factorization.

16210977671989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144027072, while the sum is 73.

The spelling of 16210977671989 in words is "sixteen trillion, two hundred ten billion, nine hundred seventy-seven million, six hundred seventy-one thousand, nine hundred eighty-nine".