16610254621 has 2 divisors, whose sum is σ = 16610254622. Its totient is φ = 16610254620.

The previous prime is 16610254603. The next prime is 16610254657. The reversal of 16610254621 is 12645201661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12776911225 + 3833343396 = 113035^2 + 61914^2 .

It is a cyclic number.

It is not a de Polignac number, because 16610254621 - 2¹¹ = 16610252573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16610254121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8305127310 + 8305127311.

It is an arithmetic number, because the mean of its divisors is an integer number (8305127311).

Almost surely, 2^16610254621 is an apocalyptic number.

It is an amenable number.

16610254621 is a deficient number, since it is larger than the sum of its proper divisors (1).

16610254621 is an equidigital number, since it uses as much as digits as its factorization.

16610254621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 34.

The spelling of 16610254621 in words is "sixteen billion, six hundred ten million, two hundred fifty-four thousand, six hundred twenty-one".