661103477 has 2 divisors, whose sum is σ = 661103478. Its totient is φ = 661103476.

The previous prime is 661103447. The next prime is 661103533. The reversal of 661103477 is 774301166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 412536721 + 248566756 = 20311^2 + 15766^2 .

It is a cyclic number.

It is not a de Polignac number, because 661103477 - 2¹⁶ = 661037941 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661103447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330551738 + 330551739.

It is an arithmetic number, because the mean of its divisors is an integer number (330551739).

Almost surely, 2^661103477 is an apocalyptic number.

It is an amenable number.

661103477 is a deficient number, since it is larger than the sum of its proper divisors (1).

661103477 is an equidigital number, since it uses as much as digits as its factorization.

661103477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 661103477 is about 25711.9325800298. The cubic root of 661103477 is about 871.1437271907.

The spelling of 661103477 in words is "six hundred sixty-one million, one hundred three thousand, four hundred seventy-seven".