6555902921 has 2 divisors, whose sum is σ = 6555902922. Its totient is φ = 6555902920.

The previous prime is 6555902887. The next prime is 6555902923. The reversal of 6555902921 is 1292095556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6497166025 + 58736896 = 80605^2 + 7664^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6555902921 is a prime.

It is a Sophie Germain prime.

Together with 6555902923, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (6555902923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3277951460 + 3277951461.

It is an arithmetic number, because the mean of its divisors is an integer number (3277951461).

Almost surely, 2^6555902921 is an apocalyptic number.

6555902921 is the 43280-th centered heptagonal number.

It is an amenable number.

6555902921 is a deficient number, since it is larger than the sum of its proper divisors (1).

6555902921 is an equidigital number, since it uses as much as digits as its factorization.

6555902921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 243000, while the sum is 44.

The square root of 6555902921 is about 80968.5304362133. The cubic root of 6555902921 is about 1871.5905254140.

The spelling of 6555902921 in words is "six billion, five hundred fifty-five million, nine hundred two thousand, nine hundred twenty-one".