661434001103 has 2 divisors, whose sum is σ = 661434001104. Its totient is φ = 661434001102.

The previous prime is 661434001009. The next prime is 661434001141. The reversal of 661434001103 is 301100434166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 661434001103 - 2²⁰ = 661432952527 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661434001303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330717000551 + 330717000552.

It is an arithmetic number, because the mean of its divisors is an integer number (330717000552).

Almost surely, 2^661434001103 is an apocalyptic number.

661434001103 is a deficient number, since it is larger than the sum of its proper divisors (1).

661434001103 is an equidigital number, since it uses as much as digits as its factorization.

661434001103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

Adding to 661434001103 its reverse (301100434166), we get a palindrome (962534435269).

The spelling of 661434001103 in words is "six hundred sixty-one billion, four hundred thirty-four million, one thousand, one hundred three".