61818471789 has 64 divisors (see below), whose sum is σ = 90363340800. Its totient is φ = 37471546112.

The previous prime is 61818471749. The next prime is 61818471817. The reversal of 61818471789 is 98717481816.

61818471789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 61818471789 - 2⁹ = 61818471277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61818471739) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 38324347 + ... + 38325959.

It is an arithmetic number, because the mean of its divisors is an integer number (1411927200).

Almost surely, 2^61818471789 is an apocalyptic number.

61818471789 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

It is an amenable number.

61818471789 is a deficient number, since it is larger than the sum of its proper divisors (28544869011).

61818471789 is a wasteful number, since it uses less digits than its factorization.

61818471789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1954.

The product of its digits is 5419008, while the sum is 60.

The spelling of 61818471789 in words is "sixty-one billion, eight hundred eighteen million, four hundred seventy-one thousand, seven hundred eighty-nine".