61643584386 has 24 divisors (see below), whose sum is σ = 138507807984. Its totient is φ = 20547861300.

The previous prime is 61643584369. The next prime is 61643584391. The reversal of 61643584386 is 68348534616.

61643584386 is a `hidden beast` number, since 6 + 16 + 43 + 584 + 3 + 8 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63418840 + ... + 63419811.

It is an arithmetic number, because the mean of its divisors is an integer number (5771158666).

Almost surely, 2^61643584386 is an apocalyptic number.

61643584386 is an abundant number, since it is smaller than the sum of its proper divisors (76864223598).

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

61643584386 is a wasteful number, since it uses less digits than its factorization.

61643584386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126838668 (or 126838656 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 54.

The spelling of 61643584386 in words is "sixty-one billion, six hundred forty-three million, five hundred eighty-four thousand, three hundred eighty-six".