61343243918 has 24 divisors (see below), whose sum is σ = 101271457224. Its totient is φ = 27847136240.

The previous prime is 61343243891. The next prime is 61343243947. The reversal of 61343243918 is 81934234316.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 23105 + ... + 351027.

It is an arithmetic number, because the mean of its divisors is an integer number (4219644051).

Almost surely, 2^61343243918 is an apocalyptic number.

61343243918 is a deficient number, since it is larger than the sum of its proper divisors (39928213306).

61343243918 is a wasteful number, since it uses less digits than its factorization.

61343243918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328720 (or 328709 counting only the distinct ones).

The product of its digits is 373248, while the sum is 44.

The spelling of 61343243918 in words is "sixty-one billion, three hundred forty-three million, two hundred forty-three thousand, nine hundred eighteen".