61819240897 has 2 divisors, whose sum is σ = 61819240898. Its totient is φ = 61819240896.

The previous prime is 61819240871. The next prime is 61819240937. The reversal of 61819240897 is 79804291816.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34024015936 + 27795224961 = 184456^2 + 166719^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61819240897 is a prime.

It is not a weakly prime, because it can be changed into another prime (61819243897) 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, 30909620448 + 30909620449.

It is an arithmetic number, because the mean of its divisors is an integer number (30909620449).

Almost surely, 2^61819240897 is an apocalyptic number.

It is an amenable number.

61819240897 is a deficient number, since it is larger than the sum of its proper divisors (1).

61819240897 is an equidigital number, since it uses as much as digits as its factorization.

61819240897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1741824, while the sum is 55.

The spelling of 61819240897 in words is "sixty-one billion, eight hundred nineteen million, two hundred forty thousand, eight hundred ninety-seven".