65816261638 has 8 divisors (see below), whose sum is σ = 98783762688. Its totient is φ = 32888340744.

The previous prime is 65816261633. The next prime is 65816261647. The reversal of 65816261638 is 83616261856.

65816261638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65816261633) 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, 9890881 + ... + 9897532.

It is an arithmetic number, because the mean of its divisors is an integer number (12347970336).

Almost surely, 2^65816261638 is an apocalyptic number.

65816261638 is a deficient number, since it is larger than the sum of its proper divisors (32967501050).

65816261638 is a wasteful number, since it uses less digits than its factorization.

65816261638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19790078.

The product of its digits is 2488320, while the sum is 52.

The spelling of 65816261638 in words is "sixty-five billion, eight hundred sixteen million, two hundred sixty-one thousand, six hundred thirty-eight".