2643161557 has 2 divisors, whose sum is σ = 2643161558. Its totient is φ = 2643161556.

The previous prime is 2643161527. The next prime is 2643161561. The reversal of 2643161557 is 7551613462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2571098436 + 72063121 = 50706^2 + 8489^2 .

It is a cyclic number.

It is not a de Polignac number, because 2643161557 - 2¹¹ = 2643159509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2643161527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1321580778 + 1321580779.

It is an arithmetic number, because the mean of its divisors is an integer number (1321580779).

Almost surely, 2^2643161557 is an apocalyptic number.

It is an amenable number.

2643161557 is a deficient number, since it is larger than the sum of its proper divisors (1).

2643161557 is an equidigital number, since it uses as much as digits as its factorization.

2643161557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 40.

The square root of 2643161557 is about 51411.6869690151. The cubic root of 2643161557 is about 1382.6361354322.

The spelling of 2643161557 in words is "two billion, six hundred forty-three million, one hundred sixty-one thousand, five hundred fifty-seven".