5268721561 has 2 divisors, whose sum is σ = 5268721562. Its totient is φ = 5268721560.

The previous prime is 5268721547. The next prime is 5268721613. The reversal of 5268721561 is 1651278625.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3302685961 + 1966035600 = 57469^2 + 44340^2 .

It is a cyclic number.

It is not a de Polignac number, because 5268721561 - 2⁷ = 5268721433 is a prime.

It is a super-3 number, since 3×5268721561³ (a number of 30 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (5268721541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2634360780 + 2634360781.

It is an arithmetic number, because the mean of its divisors is an integer number (2634360781).

Almost surely, 2^5268721561 is an apocalyptic number.

It is an amenable number.

5268721561 is a deficient number, since it is larger than the sum of its proper divisors (1).

5268721561 is an equidigital number, since it uses as much as digits as its factorization.

5268721561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 201600, while the sum is 43.

The square root of 5268721561 is about 72585.9598062876. The cubic root of 5268721561 is about 1740.0767968262.

The spelling of 5268721561 in words is "five billion, two hundred sixty-eight million, seven hundred twenty-one thousand, five hundred sixty-one".