2055478661 has 2 divisors, whose sum is σ = 2055478662. Its totient is φ = 2055478660.

The previous prime is 2055478627. The next prime is 2055478669. The reversal of 2055478661 is 1668745502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1207562500 + 847916161 = 34750^2 + 29119^2 .

It is a cyclic number.

It is not a de Polignac number, because 2055478661 - 2²² = 2051284357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2055478669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1027739330 + 1027739331.

It is an arithmetic number, because the mean of its divisors is an integer number (1027739331).

Almost surely, 2^2055478661 is an apocalyptic number.

It is an amenable number.

2055478661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2055478661 is an equidigital number, since it uses as much as digits as its factorization.

2055478661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 403200, while the sum is 44.

The square root of 2055478661 is about 45337.3870111633. The cubic root of 2055478661 is about 1271.4647495269.

The spelling of 2055478661 in words is "two billion, fifty-five million, four hundred seventy-eight thousand, six hundred sixty-one".