61330778306191 has 2 divisors, whose sum is σ = 61330778306192. Its totient is φ = 61330778306190.

The previous prime is 61330778306107. The next prime is 61330778306219. The reversal of 61330778306191 is 19160387703316.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61330778306191 - 2²³ = 61330769917583 is a prime.

It is a super-2 number, since 2×61330778306191² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61330778306891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30665389153095 + 30665389153096.

It is an arithmetic number, because the mean of its divisors is an integer number (30665389153096).

Almost surely, 2^{61330778306191} is an apocalyptic number.

61330778306191 is a deficient number, since it is larger than the sum of its proper divisors (1).

61330778306191 is an equidigital number, since it uses as much as digits as its factorization.

61330778306191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3429216, while the sum is 55.

The spelling of 61330778306191 in words is "sixty-one trillion, three hundred thirty billion, seven hundred seventy-eight million, three hundred six thousand, one hundred ninety-one".