61643552646 has 16 divisors (see below), whose sum is σ = 132770728944. Its totient is φ = 18967246944.

The previous prime is 61643552629. The next prime is 61643552651. The reversal of 61643552646 is 64625534616.

It is a junction number, because it is equal to n+sod(n) for n = 61643552595 and 61643552604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 395150901 + ... + 395151056.

It is an arithmetic number, because the mean of its divisors is an integer number (8298170559).

Almost surely, 2^61643552646 is an apocalyptic number.

61643552646 is an abundant number, since it is smaller than the sum of its proper divisors (71127176298).

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

61643552646 is a wasteful number, since it uses less digits than its factorization.

61643552646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790301975.

The product of its digits is 3110400, while the sum is 48.

The spelling of 61643552646 in words is "sixty-one billion, six hundred forty-three million, five hundred fifty-two thousand, six hundred forty-six".