61211539759 has 2 divisors, whose sum is σ = 61211539760. Its totient is φ = 61211539758.

The previous prime is 61211539673. The next prime is 61211539801. The reversal of 61211539759 is 95793511216.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61211539759 - 2⁹ = 61211539247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61211539159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30605769879 + 30605769880.

It is an arithmetic number, because the mean of its divisors is an integer number (30605769880).

Almost surely, 2^61211539759 is an apocalyptic number.

61211539759 is a deficient number, since it is larger than the sum of its proper divisors (1).

61211539759 is an equidigital number, since it uses as much as digits as its factorization.

61211539759 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 510300, while the sum is 49.

The spelling of 61211539759 in words is "sixty-one billion, two hundred eleven million, five hundred thirty-nine thousand, seven hundred fifty-nine".