1655279993 has 2 divisors, whose sum is σ = 1655279994. Its totient is φ = 1655279992.

The previous prime is 1655279959. The next prime is 1655280001. The reversal of 1655279993 is 3999725561.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1421893264 + 233386729 = 37708^2 + 15277^2 .

It is a cyclic number.

It is not a de Polignac number, because 1655279993 - 2⁶ = 1655279929 is a prime.

It is not a weakly prime, because it can be changed into another prime (1655279903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 827639996 + 827639997.

It is an arithmetic number, because the mean of its divisors is an integer number (827639997).

Almost surely, 2^1655279993 is an apocalyptic number.

It is an amenable number.

1655279993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1655279993 is an equidigital number, since it uses as much as digits as its factorization.

1655279993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4592700, while the sum is 56.

The square root of 1655279993 is about 40685.1323335687. The cubic root of 1655279993 is about 1182.9248501792.

The spelling of 1655279993 in words is "one billion, six hundred fifty-five million, two hundred seventy-nine thousand, nine hundred ninety-three".