2660001557 has 2 divisors, whose sum is σ = 2660001558. Its totient is φ = 2660001556.

The previous prime is 2660001527. The next prime is 2660001583. The reversal of 2660001557 is 7551000662.

It is a happy number.

2660001557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2503901521 + 156100036 = 50039^2 + 12494^2 .

It is a cyclic number.

It is not a de Polignac number, because 2660001557 - 2⁶ = 2660001493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2660001517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330000778 + 1330000779.

It is an arithmetic number, because the mean of its divisors is an integer number (1330000779).

Almost surely, 2^2660001557 is an apocalyptic number.

It is an amenable number.

2660001557 is a deficient number, since it is larger than the sum of its proper divisors (1).

2660001557 is an equidigital number, since it uses as much as digits as its factorization.

2660001557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 2660001557 is about 51575.2029273759. The cubic root of 2660001557 is about 1385.5662525774.

The spelling of 2660001557 in words is "two billion, six hundred sixty million, one thousand, five hundred fifty-seven".