61643012636 has 12 divisors (see below), whose sum is σ = 108096785328. Its totient is φ = 30758216832.

The previous prime is 61643012611. The next prime is 61643012659. The reversal of 61643012636 is 63621034616.

It is a super-2 number, since 2×61643012636² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61643012636.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 15820181 + ... + 15824076.

It is an arithmetic number, because the mean of its divisors is an integer number (9008065444).

Almost surely, 2^61643012636 is an apocalyptic number.

It is an amenable number.

61643012636 is a deficient number, since it is larger than the sum of its proper divisors (46453772692).

61643012636 is a wasteful number, since it uses less digits than its factorization.

61643012636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31644748 (or 31644746 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 38.

The spelling of 61643012636 in words is "sixty-one billion, six hundred forty-three million, twelve thousand, six hundred thirty-six".