16464237254981 has 2 divisors, whose sum is σ = 16464237254982. Its totient is φ = 16464237254980.

The previous prime is 16464237254917. The next prime is 16464237255071. The reversal of 16464237254981 is 18945273246461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14341300834081 + 2122936420900 = 3786991^2 + 1457030^2 .

It is an emirp because it is prime and its reverse (18945273246461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16464237254981 - 2⁶ = 16464237254917 is a prime.

It is a super-2 number, since 2×16464237254981² (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 (16464237254911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8232118627490 + 8232118627491.

It is an arithmetic number, because the mean of its divisors is an integer number (8232118627491).

Almost surely, 2^{16464237254981} is an apocalyptic number.

It is an amenable number.

16464237254981 is a deficient number, since it is larger than the sum of its proper divisors (1).

16464237254981 is an equidigital number, since it uses as much as digits as its factorization.

16464237254981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69672960, while the sum is 62.

The spelling of 16464237254981 in words is "sixteen trillion, four hundred sixty-four billion, two hundred thirty-seven million, two hundred fifty-four thousand, nine hundred eighty-one".