61819240871 has 2 divisors, whose sum is σ = 61819240872. Its totient is φ = 61819240870.

The previous prime is 61819240849. The next prime is 61819240897. The reversal of 61819240871 is 17804291816.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61819240871 - 2²² = 61815046567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61819240831) 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, 30909620435 + 30909620436.

It is an arithmetic number, because the mean of its divisors is an integer number (30909620436).

Almost surely, 2^61819240871 is an apocalyptic number.

61819240871 is a deficient number, since it is larger than the sum of its proper divisors (1).

61819240871 is an equidigital number, since it uses as much as digits as its factorization.

61819240871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 47.

The spelling of 61819240871 in words is "sixty-one billion, eight hundred nineteen million, two hundred forty thousand, eight hundred seventy-one".