553515661 has 2 divisors, whose sum is σ = 553515662. Its totient is φ = 553515660.

The previous prime is 553515643. The next prime is 553515673. The reversal of 553515661 is 166515355.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 373687561 + 179828100 = 19331^2 + 13410^2 .

It is a cyclic number.

It is not a de Polignac number, because 553515661 - 2⁷ = 553515533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 553515661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (553515691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 276757830 + 276757831.

It is an arithmetic number, because the mean of its divisors is an integer number (276757831).

Almost surely, 2^553515661 is an apocalyptic number.

It is an amenable number.

553515661 is a deficient number, since it is larger than the sum of its proper divisors (1).

553515661 is an equidigital number, since it uses as much as digits as its factorization.

553515661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67500, while the sum is 37.

The square root of 553515661 is about 23526.9135459796. The cubic root of 553515661 is about 821.0632949293.

The spelling of 553515661 in words is "five hundred fifty-three million, five hundred fifteen thousand, six hundred sixty-one".