634466989579 has 4 divisors (see below), whose sum is σ = 634645867384. Its totient is φ = 634288111776.

The previous prime is 634466989517. The next prime is 634466989603. The reversal of 634466989579 is 975989664436.

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 634466989579 - 2¹³ = 634466981387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634466981579) 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, 89433582 + ... + 89440675.

It is an arithmetic number, because the mean of its divisors is an integer number (158661466846).

Almost surely, 2^634466989579 is an apocalyptic number.

634466989579 is a deficient number, since it is larger than the sum of its proper divisors (178877805).

634466989579 is a wasteful number, since it uses less digits than its factorization.

634466989579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178877804.

The product of its digits is 2116316160, while the sum is 76.

The spelling of 634466989579 in words is "six hundred thirty-four billion, four hundred sixty-six million, nine hundred eighty-nine thousand, five hundred seventy-nine".