65139567438 has 64 divisors (see below), whose sum is σ = 148410662400. Its totient is φ = 18867192960.

The previous prime is 65139567431. The next prime is 65139567443. The reversal of 65139567438 is 83476593156.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65139567431) 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, 2154208 + ... + 2184236.

It is an arithmetic number, because the mean of its divisors is an integer number (2318916600).

Almost surely, 2^65139567438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65139567438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74205331200).

65139567438 is an abundant number, since it is smaller than the sum of its proper divisors (83271094962).

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

65139567438 is a wasteful number, since it uses less digits than its factorization.

65139567438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31497.

The product of its digits is 16329600, while the sum is 57.

The spelling of 65139567438 in words is "sixty-five billion, one hundred thirty-nine million, five hundred sixty-seven thousand, four hundred thirty-eight".