5155394638 has 4 divisors (see below), whose sum is σ = 7733091960. Its totient is φ = 2577697318.

The previous prime is 5155394633. The next prime is 5155394669. The reversal of 5155394638 is 8364935515.

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: 8364935515 = 5 ⋅1672987103.

It is a junction number, because it is equal to n+sod(n) for n = 5155394591 and 5155394600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5155394633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1288848658 + ... + 1288848661.

It is an arithmetic number, because the mean of its divisors is an integer number (1933272990).

Almost surely, 2^5155394638 is an apocalyptic number.

5155394638 is a deficient number, since it is larger than the sum of its proper divisors (2577697322).

5155394638 is a wasteful number, since it uses less digits than its factorization.

5155394638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2577697321.

The product of its digits is 1944000, while the sum is 49.

The square root of 5155394638 is about 71801.0768582199. The cubic root of 5155394638 is about 1727.5102723058.

The spelling of 5155394638 in words is "five billion, one hundred fifty-five million, three hundred ninety-four thousand, six hundred thirty-eight".