65404857867552 has 144 divisors (see below), whose sum is σ = 212653750038912. Its totient is φ = 18679369328640.

The previous prime is 65404857867551. The next prime is 65404857867593. The reversal of 65404857867552 is 25576875840456.

65404857867552 is a `hidden beast` number, since 6 + 5 + 4 + 0 + 4 + 8 + 5 + 7 + 8 + 67 + 552 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (65404857867551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1838724 + ... + 11584067.

It is an arithmetic number, because the mean of its divisors is an integer number (1476762153048).

Almost surely, 2^{65404857867552} 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 65404857867552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106326875019456).

65404857867552 is an abundant number, since it is smaller than the sum of its proper divisors (147248892171360).

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

65404857867552 is a wasteful number, since it uses less digits than its factorization.

65404857867552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13425231 (or 13425220 counting only the distinct ones).

The product of its (nonzero) digits is 2257920000, while the sum is 72.

The spelling of 65404857867552 in words is "sixty-five trillion, four hundred four billion, eight hundred fifty-seven million, eight hundred sixty-seven thousand, five hundred fifty-two".