65381515723 has 4 divisors (see below), whose sum is σ = 65559667360. Its totient is φ = 65203364088.

The previous prime is 65381515711. The next prime is 65381515757. The reversal of 65381515723 is 32751518356.

65381515723 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65381515723 - 2²¹ = 65379418571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65381915723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89075268 + ... + 89076001.

It is an arithmetic number, because the mean of its divisors is an integer number (16389916840).

Almost surely, 2^65381515723 is an apocalyptic number.

65381515723 is a deficient number, since it is larger than the sum of its proper divisors (178151637).

65381515723 is a wasteful number, since it uses less digits than its factorization.

65381515723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178151636.

The product of its digits is 756000, while the sum is 46.

The spelling of 65381515723 in words is "sixty-five billion, three hundred eighty-one million, five hundred fifteen thousand, seven hundred twenty-three".