700215661 has 2 divisors, whose sum is σ = 700215662. Its totient is φ = 700215660.

The previous prime is 700215653. The next prime is 700215667. The reversal of 700215661 is 166512007.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 680688100 + 19527561 = 26090^2 + 4419^2 .

It is a cyclic number.

It is not a de Polignac number, because 700215661 - 2³ = 700215653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (700215667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 350107830 + 350107831.

It is an arithmetic number, because the mean of its divisors is an integer number (350107831).

Almost surely, 2^700215661 is an apocalyptic number.

It is an amenable number.

700215661 is a deficient number, since it is larger than the sum of its proper divisors (1).

700215661 is an equidigital number, since it uses as much as digits as its factorization.

700215661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 700215661 is about 26461.5884065942. The cubic root of 700215661 is about 887.9951763157.

Adding to 700215661 its reverse (166512007), we get a palindrome (866727668).

The spelling of 700215661 in words is "seven hundred million, two hundred fifteen thousand, six hundred sixty-one".