1655383817 has 2 divisors, whose sum is σ = 1655383818. Its totient is φ = 1655383816.

The previous prime is 1655383661. The next prime is 1655383837. The reversal of 1655383817 is 7183835561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1426648441 + 228735376 = 37771^2 + 15124^2 .

It is a cyclic number.

It is not a de Polignac number, because 1655383817 - 2¹⁴ = 1655367433 is a prime.

It is not a weakly prime, because it can be changed into another prime (1655383837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 827691908 + 827691909.

It is an arithmetic number, because the mean of its divisors is an integer number (827691909).

Almost surely, 2^1655383817 is an apocalyptic number.

It is an amenable number.

1655383817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1655383817 is an equidigital number, since it uses as much as digits as its factorization.

1655383817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 604800, while the sum is 47.

The square root of 1655383817 is about 40686.4082587785. The cubic root of 1655383817 is about 1182.9495818304.

The spelling of 1655383817 in words is "one billion, six hundred fifty-five million, three hundred eighty-three thousand, eight hundred seventeen".