661341481 has 2 divisors, whose sum is σ = 661341482. Its totient is φ = 661341480.

The previous prime is 661341437. The next prime is 661341487. The reversal of 661341481 is 184143166.

661341481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 432848025 + 228493456 = 20805^2 + 15116^2 .

It is a cyclic number.

It is not a de Polignac number, because 661341481 - 2⁷ = 661341353 is a prime.

It is a super-2 number, since 2×661341481² = 874745108982546722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (661341487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330670740 + 330670741.

It is an arithmetic number, because the mean of its divisors is an integer number (330670741).

Almost surely, 2^661341481 is an apocalyptic number.

It is an amenable number.

661341481 is a deficient number, since it is larger than the sum of its proper divisors (1).

661341481 is an equidigital number, since it uses as much as digits as its factorization.

661341481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 34.

The square root of 661341481 is about 25716.5604426408. The cubic root of 661341481 is about 871.2482548594.

The spelling of 661341481 in words is "six hundred sixty-one million, three hundred forty-one thousand, four hundred eighty-one".