65706994638 has 16 divisors (see below), whose sum is σ = 146015543760. Its totient is φ = 21902331528.

The previous prime is 65706994631. The next prime is 65706994651. The reversal of 65706994638 is 83649960756.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65706994631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 608398045 + ... + 608398152.

It is an arithmetic number, because the mean of its divisors is an integer number (9125971485).

Almost surely, 2^65706994638 is an apocalyptic number.

65706994638 is an abundant number, since it is smaller than the sum of its proper divisors (80308549122).

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

65706994638 is a wasteful number, since it uses less digits than its factorization.

65706994638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1216796208 (or 1216796202 counting only the distinct ones).

The product of its (nonzero) digits is 58786560, while the sum is 63.

The spelling of 65706994638 in words is "sixty-five billion, seven hundred six million, nine hundred ninety-four thousand, six hundred thirty-eight".