61961161187 has 2 divisors, whose sum is σ = 61961161188. Its totient is φ = 61961161186.

The previous prime is 61961161151. The next prime is 61961161219. The reversal of 61961161187 is 78116116916.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61961161187 - 2¹² = 61961157091 is a prime.

It is not a weakly prime, because it can be changed into another prime (61961167187) 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, 30980580593 + 30980580594.

It is an arithmetic number, because the mean of its divisors is an integer number (30980580594).

Almost surely, 2^61961161187 is an apocalyptic number.

61961161187 is a deficient number, since it is larger than the sum of its proper divisors (1).

61961161187 is an equidigital number, since it uses as much as digits as its factorization.

61961161187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 47.

The spelling of 61961161187 in words is "sixty-one billion, nine hundred sixty-one million, one hundred sixty-one thousand, one hundred eighty-seven".