61104818891 has 2 divisors, whose sum is σ = 61104818892. Its totient is φ = 61104818890.

The previous prime is 61104818833. The next prime is 61104818897. The reversal of 61104818891 is 19881840116.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61104818891 - 2²² = 61100624587 is a prime.

It is not a weakly prime, because it can be changed into another prime (61104818897) 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, 30552409445 + 30552409446.

It is an arithmetic number, because the mean of its divisors is an integer number (30552409446).

Almost surely, 2^61104818891 is an apocalyptic number.

61104818891 is a deficient number, since it is larger than the sum of its proper divisors (1).

61104818891 is an equidigital number, since it uses as much as digits as its factorization.

61104818891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 110592, while the sum is 47.

The spelling of 61104818891 in words is "sixty-one billion, one hundred four million, eight hundred eighteen thousand, eight hundred ninety-one".