65661983 has 2 divisors, whose sum is σ = 65661984. Its totient is φ = 65661982.

The previous prime is 65661971. The next prime is 65661991. The reversal of 65661983 is 38916656.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65661983 is a prime.

It is a super-2 number, since 2×65661983² = 8622992022984578, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65661083) 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, 32830991 + 32830992.

It is an arithmetic number, because the mean of its divisors is an integer number (32830992).

Almost surely, 2^65661983 is an apocalyptic number.

65661983 is a deficient number, since it is larger than the sum of its proper divisors (1).

65661983 is an equidigital number, since it uses as much as digits as its factorization.

65661983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 44.

The square root of 65661983 is about 8103.2081918213. The cubic root of 65661983 is about 403.4329179839.

The spelling of 65661983 in words is "sixty-five million, six hundred sixty-one thousand, nine hundred eighty-three".