61680945789 has 12 divisors (see below), whose sum is σ = 89351461056. Its totient is φ = 41002125192.

The previous prime is 61680945787. The next prime is 61680945797. The reversal of 61680945789 is 98754908616.

61680945789 is a `hidden beast` number, since 616 + 8 + 0 + 9 + 4 + 5 + 7 + 8 + 9 = 666.

It is not a de Polignac number, because 61680945789 - 2¹ = 61680945787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61680945787) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9872149 + ... + 9878394.

It is an arithmetic number, because the mean of its divisors is an integer number (7445955088).

Almost surely, 2^61680945789 is an apocalyptic number.

It is an amenable number.

61680945789 is a deficient number, since it is larger than the sum of its proper divisors (27670515267).

61680945789 is a wasteful number, since it uses less digits than its factorization.

61680945789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19750896 (or 19750893 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 63.

The spelling of 61680945789 in words is "sixty-one billion, six hundred eighty million, nine hundred forty-five thousand, seven hundred eighty-nine".