61021663 has 2 divisors, whose sum is σ = 61021664. Its totient is φ = 61021662.

The previous prime is 61021627. The next prime is 61021699. The reversal of 61021663 is 36612016.

It is a balanced prime because it is at equal distance from previous prime (61021627) and next prime (61021699).

It is a cyclic number.

It is not a de Polignac number, because 61021663 - 2⁹ = 61021151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61021613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30510831 + 30510832.

It is an arithmetic number, because the mean of its divisors is an integer number (30510832).

Almost surely, 2^61021663 is an apocalyptic number.

61021663 is a deficient number, since it is larger than the sum of its proper divisors (1).

61021663 is an equidigital number, since it uses as much as digits as its factorization.

61021663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 61021663 is about 7811.6363842667. The cubic root of 61021663 is about 393.6963118871.

Adding to 61021663 its reverse (36612016), we get a palindrome (97633679).

The spelling of 61021663 in words is "sixty-one million, twenty-one thousand, six hundred sixty-three".