1855006553 has 2 divisors, whose sum is σ = 1855006554. Its totient is φ = 1855006552.

The previous prime is 1855006457. The next prime is 1855006567. The reversal of 1855006553 is 3556005581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1847968144 + 7038409 = 42988^2 + 2653^2 .

It is a cyclic number.

It is not a de Polignac number, because 1855006553 - 2⁸ = 1855006297 is a prime.

It is not a weakly prime, because it can be changed into another prime (1855006453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 927503276 + 927503277.

It is an arithmetic number, because the mean of its divisors is an integer number (927503277).

Almost surely, 2^1855006553 is an apocalyptic number.

It is an amenable number.

1855006553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1855006553 is an equidigital number, since it uses as much as digits as its factorization.

1855006553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90000, while the sum is 38.

The square root of 1855006553 is about 43069.7870089927. The cubic root of 1855006553 is about 1228.7074250539.

The spelling of 1855006553 in words is "one billion, eight hundred fifty-five million, six thousand, five hundred fifty-three".