65867408840 has 128 divisors (see below), whose sum is σ = 156231504000. Its totient is φ = 24955865088.

The previous prime is 65867408839. The next prime is 65867408909. The reversal of 65867408840 is 4880476856.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58652519 + ... + 58653641.

It is an arithmetic number, because the mean of its divisors is an integer number (1220558625).

Almost surely, 2^65867408840 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 65867408840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78115752000).

65867408840 is an abundant number, since it is smaller than the sum of its proper divisors (90364095160).

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

65867408840 is a wasteful number, since it uses less digits than its factorization.

65867408840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2079 (or 2075 counting only the distinct ones).

The product of its (nonzero) digits is 10321920, while the sum is 56.

The spelling of 65867408840 in words is "sixty-five billion, eight hundred sixty-seven million, four hundred eight thousand, eight hundred forty".