6616526641 has 2 divisors, whose sum is σ = 6616526642. Its totient is φ = 6616526640.

The previous prime is 6616526593. The next prime is 6616526671. The reversal of 6616526641 is 1466256166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4803044416 + 1813482225 = 69304^2 + 42585^2 .

It is a cyclic number.

It is not a de Polignac number, because 6616526641 - 2²¹ = 6614429489 is a prime.

It is not a weakly prime, because it can be changed into another prime (6616526671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3308263320 + 3308263321.

It is an arithmetic number, because the mean of its divisors is an integer number (3308263321).

Almost surely, 2^6616526641 is an apocalyptic number.

It is an amenable number.

6616526641 is a deficient number, since it is larger than the sum of its proper divisors (1).

6616526641 is an equidigital number, since it uses as much as digits as its factorization.

6616526641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 43.

The square root of 6616526641 is about 81342.0348958643. The cubic root of 6616526641 is about 1877.3418220963.

The spelling of 6616526641 in words is "six billion, six hundred sixteen million, five hundred twenty-six thousand, six hundred forty-one".