1655267521 has 2 divisors, whose sum is σ = 1655267522. Its totient is φ = 1655267520.

The previous prime is 1655267477. The next prime is 1655267531. The reversal of 1655267521 is 1257625561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 924160000 + 731107521 = 30400^2 + 27039^2 .

It is a cyclic number.

It is not a de Polignac number, because 1655267521 - 2¹⁵ = 1655234753 is a prime.

It is not a weakly prime, because it can be changed into another prime (1655267531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 827633760 + 827633761.

It is an arithmetic number, because the mean of its divisors is an integer number (827633761).

Almost surely, 2^1655267521 is an apocalyptic number.

It is an amenable number.

1655267521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1655267521 is an equidigital number, since it uses as much as digits as its factorization.

1655267521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 126000, while the sum is 40.

The square root of 1655267521 is about 40684.9790586157. The cubic root of 1655267521 is about 1182.9218791862.

The spelling of 1655267521 in words is "one billion, six hundred fifty-five million, two hundred sixty-seven thousand, five hundred twenty-one".