65561780712 has 64 divisors (see below), whose sum is σ = 179144179200. Its totient is φ = 19904901120.

The previous prime is 65561780701. The next prime is 65561780717. The reversal of 65561780712 is 21708716556.

65561780712 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (65561780717) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2579137 + ... + 2604432.

It is an arithmetic number, because the mean of its divisors is an integer number (2799127800).

Almost surely, 2^65561780712 is an apocalyptic number.

65561780712 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

65561780712 is an abundant number, since it is smaller than the sum of its proper divisors (113582398488).

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

65561780712 is a wasteful number, since it uses less digits than its factorization.

65561780712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5183626 (or 5183622 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 48.

The spelling of 65561780712 in words is "sixty-five billion, five hundred sixty-one million, seven hundred eighty thousand, seven hundred twelve".