5212555661 has 2 divisors, whose sum is σ = 5212555662. Its totient is φ = 5212555660.

The previous prime is 5212555651. The next prime is 5212555669. The reversal of 5212555661 is 1665552125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3576757636 + 1635798025 = 59806^2 + 40445^2 .

It is a cyclic number.

It is not a de Polignac number, because 5212555661 - 2³⁰ = 4138813837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5212555669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2606277830 + 2606277831.

It is an arithmetic number, because the mean of its divisors is an integer number (2606277831).

Almost surely, 2^5212555661 is an apocalyptic number.

It is an amenable number.

5212555661 is a deficient number, since it is larger than the sum of its proper divisors (1).

5212555661 is an equidigital number, since it uses as much as digits as its factorization.

5212555661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90000, while the sum is 38.

The square root of 5212555661 is about 72198.0308664994. The cubic root of 5212555661 is about 1733.8714751127.

The spelling of 5212555661 in words is "five billion, two hundred twelve million, five hundred fifty-five thousand, six hundred sixty-one".