65378726408 has 12 divisors (see below), whose sum is σ = 122586468045. Its totient is φ = 32689001600.

The previous prime is 65378726401. The next prime is 65378726411. The reversal of 65378726408 is 80462787356.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 60830303044 + 4548423364 = 246638^2 + 67442^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=180802.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65378726401) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 678008 + ... + 768408.

Almost surely, 2^65378726408 is an apocalyptic number.

It is an amenable number.

65378726408 is a deficient number, since it is larger than the sum of its proper divisors (57207741637).

65378726408 is an frugal number, since it uses more digits than its factorization.

65378726408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180808 (or 90403 counting only the distinct ones).

The product of its (nonzero) digits is 13547520, while the sum is 56.

The spelling of 65378726408 in words is "sixty-five billion, three hundred seventy-eight million, seven hundred twenty-six thousand, four hundred eight".