61481803891 has 2 divisors, whose sum is σ = 61481803892. Its totient is φ = 61481803890.

The previous prime is 61481803879. The next prime is 61481803937. The reversal of 61481803891 is 19830818416.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61481803891 - 2¹³ = 61481795699 is a prime.

It is not a weakly prime, because it can be changed into another prime (61481803091) 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, 30740901945 + 30740901946.

It is an arithmetic number, because the mean of its divisors is an integer number (30740901946).

Almost surely, 2^61481803891 is an apocalyptic number.

61481803891 is a deficient number, since it is larger than the sum of its proper divisors (1).

61481803891 is an equidigital number, since it uses as much as digits as its factorization.

61481803891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 331776, while the sum is 49.

The spelling of 61481803891 in words is "sixty-one billion, four hundred eighty-one million, eight hundred three thousand, eight hundred ninety-one".