64547780616 has 96 divisors (see below), whose sum is σ = 190837501920. Its totient is φ = 19546790400.

The previous prime is 64547780597. The next prime is 64547780623. The reversal of 64547780616 is 61608774546.

64547780616 is a `hidden beast` number, since 6 + 4 + 547 + 7 + 80 + 6 + 16 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1185936 + ... + 1239168.

It is an arithmetic number, because the mean of its divisors is an integer number (1987890645).

Almost surely, 2^64547780616 is an apocalyptic number.

64547780616 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64547780616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95418750960).

64547780616 is an abundant number, since it is smaller than the sum of its proper divisors (126289721304).

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

64547780616 is a wasteful number, since it uses less digits than its factorization.

64547780616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54787 (or 54780 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 54.

The spelling of 64547780616 in words is "sixty-four billion, five hundred forty-seven million, seven hundred eighty thousand, six hundred sixteen".