1655056021 has 2 divisors, whose sum is σ = 1655056022. Its totient is φ = 1655056020.

The previous prime is 1655056003. The next prime is 1655056027. The reversal of 1655056021 is 1206505561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 898200900 + 756855121 = 29970^2 + 27511^2 .

It is a cyclic number.

It is not a de Polignac number, because 1655056021 - 2¹⁷ = 1654924949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1655056027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 827528010 + 827528011.

It is an arithmetic number, because the mean of its divisors is an integer number (827528011).

Almost surely, 2^1655056021 is an apocalyptic number.

It is an amenable number.

1655056021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1655056021 is an equidigital number, since it uses as much as digits as its factorization.

1655056021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 1655056021 is about 40682.3797361954. The cubic root of 1655056021 is about 1182.8714948564.

The spelling of 1655056021 in words is "one billion, six hundred fifty-five million, fifty-six thousand, twenty-one".