65391388452 has 144 divisors (see below), whose sum is σ = 188897508800. Its totient is φ = 19652347008.

The previous prime is 65391388429. The next prime is 65391388457. The reversal of 65391388452 is 25488319356.

65391388452 is a `hidden beast` number, since 6 + 53 + 9 + 138 + 8 + 452 = 666.

65391388452 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (65391388457) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 483174 + ... + 603522.

Almost surely, 2^65391388452 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 65391388452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94448754400).

65391388452 is an abundant number, since it is smaller than the sum of its proper divisors (123506120348).

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

65391388452 is a wasteful number, since it uses less digits than its factorization.

65391388452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120424 (or 120410 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 54.

The spelling of 65391388452 in words is "sixty-five billion, three hundred ninety-one million, three hundred eighty-eight thousand, four hundred fifty-two".