16147225681 has 2 divisors, whose sum is σ = 16147225682. Its totient is φ = 16147225680.

The previous prime is 16147225673. The next prime is 16147225733. The reversal of 16147225681 is 18652274161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12766966081 + 3380259600 = 112991^2 + 58140^2 .

It is a cyclic number.

It is not a de Polignac number, because 16147225681 - 2³ = 16147225673 is a prime.

It is a super-2 number, since 2×16147225681² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16147226681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8073612840 + 8073612841.

It is an arithmetic number, because the mean of its divisors is an integer number (8073612841).

Almost surely, 2^16147225681 is an apocalyptic number.

It is an amenable number.

16147225681 is a deficient number, since it is larger than the sum of its proper divisors (1).

16147225681 is an equidigital number, since it uses as much as digits as its factorization.

16147225681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 43.

The spelling of 16147225681 in words is "sixteen billion, one hundred forty-seven million, two hundred twenty-five thousand, six hundred eighty-one".