2656640501 has 2 divisors, whose sum is σ = 2656640502. Its totient is φ = 2656640500.

The previous prime is 2656640429. The next prime is 2656640513. The reversal of 2656640501 is 1050466562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1572519025 + 1084121476 = 39655^2 + 32926^2 .

It is a cyclic number.

It is not a de Polignac number, because 2656640501 - 2¹⁰ = 2656639477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2656640531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1328320250 + 1328320251.

It is an arithmetic number, because the mean of its divisors is an integer number (1328320251).

Almost surely, 2^2656640501 is an apocalyptic number.

It is an amenable number.

2656640501 is a deficient number, since it is larger than the sum of its proper divisors (1).

2656640501 is an equidigital number, since it uses as much as digits as its factorization.

2656640501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 2656640501 is about 51542.6085971597. The cubic root of 2656640501 is about 1384.9824272816.

The spelling of 2656640501 in words is "two billion, six hundred fifty-six million, six hundred forty thousand, five hundred one".