616650001021 has 2 divisors, whose sum is σ = 616650001022. Its totient is φ = 616650001020.

The previous prime is 616650001001. The next prime is 616650001061. The reversal of 616650001021 is 120100056616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 461157795396 + 155492205625 = 679086^2 + 394325^2 .

It is a cyclic number.

It is not a de Polignac number, because 616650001021 - 2⁷ = 616650000893 is a prime.

It is a super-3 number, since 3×616650001021³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616650001001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308325000510 + 308325000511.

It is an arithmetic number, because the mean of its divisors is an integer number (308325000511).

Almost surely, 2^616650001021 is an apocalyptic number.

It is an amenable number.

616650001021 is a deficient number, since it is larger than the sum of its proper divisors (1).

616650001021 is an equidigital number, since it uses as much as digits as its factorization.

616650001021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

Adding to 616650001021 its reverse (120100056616), we get a palindrome (736750057637).

The spelling of 616650001021 in words is "six hundred sixteen billion, six hundred fifty million, one thousand, twenty-one".