61678443312 has 120 divisors (see below), whose sum is σ = 175015742720. Its totient is φ = 20275401600.

The previous prime is 61678443287. The next prime is 61678443371. The reversal of 61678443312 is 21334487616.

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 23 ways as a sum of consecutive naturals, for example, 3012213 + ... + 3032619.

Almost surely, 2^61678443312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61678443312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87507871360).

61678443312 is an abundant number, since it is smaller than the sum of its proper divisors (113337299408).

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

61678443312 is a wasteful number, since it uses less digits than its factorization.

61678443312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20711 (or 20702 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The spelling of 61678443312 in words is "sixty-one billion, six hundred seventy-eight million, four hundred forty-three thousand, three hundred twelve".