61211539603 has 2 divisors, whose sum is σ = 61211539604. Its totient is φ = 61211539602.

The previous prime is 61211539573. The next prime is 61211539637. The reversal of 61211539603 is 30693511216.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61211539603 is a prime.

It is not a weakly prime, because it can be changed into another prime (61211539673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30605769801 + 30605769802.

It is an arithmetic number, because the mean of its divisors is an integer number (30605769802).

Almost surely, 2^61211539603 is an apocalyptic number.

61211539603 is a deficient number, since it is larger than the sum of its proper divisors (1).

61211539603 is an equidigital number, since it uses as much as digits as its factorization.

61211539603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 37.

The spelling of 61211539603 in words is "sixty-one billion, two hundred eleven million, five hundred thirty-nine thousand, six hundred three".