61938864919 has 2 divisors, whose sum is σ = 61938864920. Its totient is φ = 61938864918.

The previous prime is 61938864913. The next prime is 61938864971. The reversal of 61938864919 is 91946883916.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61938864919 - 2¹¹ = 61938862871 is a prime.

It is a super-2 number, since 2×61938864919² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61938864913) 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, 30969432459 + 30969432460.

It is an arithmetic number, because the mean of its divisors is an integer number (30969432460).

Almost surely, 2^61938864919 is an apocalyptic number.

61938864919 is a deficient number, since it is larger than the sum of its proper divisors (1).

61938864919 is an equidigital number, since it uses as much as digits as its factorization.

61938864919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20155392, while the sum is 64.

The spelling of 61938864919 in words is "sixty-one billion, nine hundred thirty-eight million, eight hundred sixty-four thousand, nine hundred nineteen".