61643055600 has 180 divisors, whose sum is σ = 244478415376. Its totient is φ = 14089835520.

The previous prime is 61643055599. The next prime is 61643055637. The reversal of 61643055600 is 655034616.

61643055600 is a `hidden beast` number, since 6 + 1 + 6 + 43 + 0 + 5 + 5 + 600 = 666.

61643055600 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (180).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1197877 + ... + 1248276.

Almost surely, 2^61643055600 is an apocalyptic number.

61643055600 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61643055600 is an abundant number, since it is smaller than the sum of its proper divisors (182835359776).

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

61643055600 is a wasteful number, since it uses less digits than its factorization.

61643055600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2446184 (or 2446170 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The spelling of 61643055600 in words is "sixty-one billion, six hundred forty-three million, fifty-five thousand, six hundred".