634642605817 has 16 divisors (see below), whose sum is σ = 706992971328. Its totient is φ = 564783993280.

The previous prime is 634642605763. The next prime is 634642605859. The reversal of 634642605817 is 718506246436.

It is not a de Polignac number, because 634642605817 - 2¹¹ = 634642603769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634642602817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 970378 + ... + 1486915.

It is an arithmetic number, because the mean of its divisors is an integer number (44187060708).

Almost surely, 2^634642605817 is an apocalyptic number.

It is an amenable number.

634642605817 is a deficient number, since it is larger than the sum of its proper divisors (72350365511).

634642605817 is a wasteful number, since it uses less digits than its factorization.

634642605817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2457800.

The product of its (nonzero) digits is 5806080, while the sum is 52.

The spelling of 634642605817 in words is "six hundred thirty-four billion, six hundred forty-two million, six hundred five thousand, eight hundred seventeen".