53378681664 has 224 divisors, whose sum is σ = 180841107456. Its totient is φ = 13489735680.

The previous prime is 53378681663. The next prime is 53378681669. The reversal of 53378681664 is 46618687335.

It is a tau number, because it is divible by the number of its divisors (224).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53378681663) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 498217 + ... + 595799.

Almost surely, 2^53378681664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 53378681664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90420553728).

53378681664 is an abundant number, since it is smaller than the sum of its proper divisors (127462425792).

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

53378681664 is a wasteful number, since it uses less digits than its factorization.

53378681664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97653 (or 97643 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 57.

The spelling of 53378681664 in words is "fifty-three billion, three hundred seventy-eight million, six hundred eighty-one thousand, six hundred sixty-four".