794402536639 has 4 divisors (see below), whose sum is σ = 799159438224. Its totient is φ = 789645635056.

The previous prime is 794402536633. The next prime is 794402536663. The reversal of 794402536639 is 936635204497.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 936635204497 = 53 ⋅17672362349.

It is a cyclic number.

It is not a de Polignac number, because 794402536639 - 2²⁹ = 793865665727 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (794402536633) 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, 2378450542 + ... + 2378450875.

It is an arithmetic number, because the mean of its divisors is an integer number (199789859556).

Almost surely, 2^794402536639 is an apocalyptic number.

794402536639 is a deficient number, since it is larger than the sum of its proper divisors (4756901585).

794402536639 is a wasteful number, since it uses less digits than its factorization.

794402536639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4756901584.

The product of its (nonzero) digits is 29393280, while the sum is 58.

The spelling of 794402536639 in words is "seven hundred ninety-four billion, four hundred two million, five hundred thirty-six thousand, six hundred thirty-nine".