61778236511 has 2 divisors, whose sum is σ = 61778236512. Its totient is φ = 61778236510.

The previous prime is 61778236379. The next prime is 61778236519. The reversal of 61778236511 is 11563287716.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61778236511 - 2²² = 61774042207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61778236519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30889118255 + 30889118256.

It is an arithmetic number, because the mean of its divisors is an integer number (30889118256).

Almost surely, 2^61778236511 is an apocalyptic number.

61778236511 is a deficient number, since it is larger than the sum of its proper divisors (1).

61778236511 is an equidigital number, since it uses as much as digits as its factorization.

61778236511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 47.

The spelling of 61778236511 in words is "sixty-one billion, seven hundred seventy-eight million, two hundred thirty-six thousand, five hundred eleven".