16612122581 has 2 divisors, whose sum is σ = 16612122582. Its totient is φ = 16612122580.

The previous prime is 16612122563. The next prime is 16612122587. The reversal of 16612122581 is 18522121661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11434024900 + 5178097681 = 106930^2 + 71959^2 .

It is a cyclic number.

It is not a de Polignac number, because 16612122581 - 2²² = 16607928277 is a prime.

It is a super-2 number, since 2×16612122581² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16612122587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8306061290 + 8306061291.

It is an arithmetic number, because the mean of its divisors is an integer number (8306061291).

Almost surely, 2^16612122581 is an apocalyptic number.

It is an amenable number.

16612122581 is a deficient number, since it is larger than the sum of its proper divisors (1).

16612122581 is an equidigital number, since it uses as much as digits as its factorization.

16612122581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 35.

The spelling of 16612122581 in words is "sixteen billion, six hundred twelve million, one hundred twenty-two thousand, five hundred eighty-one".