2355577661 has 2 divisors, whose sum is σ = 2355577662. Its totient is φ = 2355577660.

The previous prime is 2355577643. The next prime is 2355577663. The reversal of 2355577661 is 1667755532.

2355577661 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., 1475328100 + 880249561 = 38410^2 + 29669^2 .

It is a cyclic number.

It is not a de Polignac number, because 2355577661 - 2¹⁸ = 2355315517 is a prime.

It is a super-2 number, since 2×2355577661² = 11097492234004461842, which contains 22 as substring.

Together with 2355577663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2355577663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1177788830 + 1177788831.

It is an arithmetic number, because the mean of its divisors is an integer number (1177788831).

Almost surely, 2^2355577661 is an apocalyptic number.

It is an amenable number.

2355577661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2355577661 is an equidigital number, since it uses as much as digits as its factorization.

2355577661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1323000, while the sum is 47.

The square root of 2355577661 is about 48534.2936592262. The cubic root of 2355577661 is about 1330.5539104587.

The spelling of 2355577661 in words is "two billion, three hundred fifty-five million, five hundred seventy-seven thousand, six hundred sixty-one".