2661553 has 2 divisors, whose sum is σ = 2661554. Its totient is φ = 2661552.

The previous prime is 2661541. The next prime is 2661557. The reversal of 2661553 is 3551662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2537649 + 123904 = 1593^2 + 352^2 .

It is a cyclic number.

It is not a de Polignac number, because 2661553 - 2²¹ = 564401 is a prime.

2661553 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2661557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330776 + 1330777.

It is an arithmetic number, because the mean of its divisors is an integer number (1330777).

2^2661553 is an apocalyptic number.

It is an amenable number.

2661553 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661553 is an equidigital number, since it uses as much as digits as its factorization.

2661553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 28.

The square root of 2661553 is about 1631.4266762561. The cubic root of 2661553 is about 138.5835576891.

The spelling of 2661553 in words is "two million, six hundred sixty-one thousand, five hundred fifty-three".