6555870649 has 2 divisors, whose sum is σ = 6555870650. Its totient is φ = 6555870648.

The previous prime is 6555870617. The next prime is 6555870661. The reversal of 6555870649 is 9460785556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4297720249 + 2258150400 = 65557^2 + 47520^2 .

It is a cyclic number.

It is not a de Polignac number, because 6555870649 - 2⁵ = 6555870617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6555870649.

It is not a weakly prime, because it can be changed into another prime (6555870149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3277935324 + 3277935325.

It is an arithmetic number, because the mean of its divisors is an integer number (3277935325).

Almost surely, 2^6555870649 is an apocalyptic number.

It is an amenable number.

6555870649 is a deficient number, since it is larger than the sum of its proper divisors (1).

6555870649 is an equidigital number, since it uses as much as digits as its factorization.

6555870649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072000, while the sum is 55.

The square root of 6555870649 is about 80968.3311486658. The cubic root of 6555870649 is about 1871.5874543868.

The spelling of 6555870649 in words is "six billion, five hundred fifty-five million, eight hundred seventy thousand, six hundred forty-nine".