5251525661 has 2 divisors, whose sum is σ = 5251525662. Its totient is φ = 5251525660.

The previous prime is 5251525649. The next prime is 5251525673. The reversal of 5251525661 is 1665251525.

It is a balanced prime because it is at equal distance from previous prime (5251525649) and next prime (5251525673).

It can be written as a sum of positive squares in only one way, i.e., 3683761636 + 1567764025 = 60694^2 + 39595^2 .

It is a cyclic number.

It is not a de Polignac number, because 5251525661 - 2⁶ = 5251525597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5251525621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2625762830 + 2625762831.

It is an arithmetic number, because the mean of its divisors is an integer number (2625762831).

Almost surely, 2^5251525661 is an apocalyptic number.

It is an amenable number.

5251525661 is a deficient number, since it is larger than the sum of its proper divisors (1).

5251525661 is an equidigital number, since it uses as much as digits as its factorization.

5251525661 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 5251525661 is about 72467.4110273025. The cubic root of 5251525661 is about 1738.1816629086.

The spelling of 5251525661 in words is "five billion, two hundred fifty-one million, five hundred twenty-five thousand, six hundred sixty-one".