61666233144 has 16 divisors (see below), whose sum is σ = 154165582920. Its totient is φ = 20555411040.

The previous prime is 61666233121. The next prime is 61666233191. The reversal of 61666233144 is 44133266616.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 61666233096 and 61666233105.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 1284713167 + ... + 1284713214.

Almost surely, 2^61666233144 is an apocalyptic number.

It is an amenable number.

61666233144 is an abundant number, since it is smaller than the sum of its proper divisors (92499349776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61666233144 is a wasteful number, since it uses less digits than its factorization.

61666233144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2569426390 (or 2569426386 counting only the distinct ones).

The product of its digits is 373248, while the sum is 42.

The spelling of 61666233144 in words is "sixty-one billion, six hundred sixty-six million, two hundred thirty-three thousand, one hundred forty-four".