61866061838 has 8 divisors (see below), whose sum is σ = 106056106032. Its totient is φ = 26514026496.

The previous prime is 61866061813. The next prime is 61866061843. The reversal of 61866061838 is 83816066816.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 61866061838.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2209502195 + ... + 2209502222.

It is an arithmetic number, because the mean of its divisors is an integer number (13257013254).

Almost surely, 2^61866061838 is an apocalyptic number.

61866061838 is a deficient number, since it is larger than the sum of its proper divisors (44190044194).

61866061838 is a wasteful number, since it uses less digits than its factorization.

61866061838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4419004426.

The product of its (nonzero) digits is 1990656, while the sum is 53.

The spelling of 61866061838 in words is "sixty-one billion, eight hundred sixty-six million, sixty-one thousand, eight hundred thirty-eight".