16610726521 has 2 divisors, whose sum is σ = 16610726522. Its totient is φ = 16610726520.

The previous prime is 16610726479. The next prime is 16610726533. The reversal of 16610726521 is 12562701661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9285249600 + 7325476921 = 96360^2 + 85589^2 .

It is a cyclic number.

It is not a de Polignac number, because 16610726521 - 2⁷ = 16610726393 is a prime.

It is not a weakly prime, because it can be changed into another prime (16610726551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8305363260 + 8305363261.

It is an arithmetic number, because the mean of its divisors is an integer number (8305363261).

Almost surely, 2^16610726521 is an apocalyptic number.

It is an amenable number.

16610726521 is a deficient number, since it is larger than the sum of its proper divisors (1).

16610726521 is an equidigital number, since it uses as much as digits as its factorization.

16610726521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 16610726521 in words is "sixteen billion, six hundred ten million, seven hundred twenty-six thousand, five hundred twenty-one".