51749446438 has 4 divisors (see below), whose sum is σ = 77624169660. Its totient is φ = 25874723218.

The previous prime is 51749446423. The next prime is 51749446447. The reversal of 51749446438 is 83464494715.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12937361608 + ... + 12937361611.

It is an arithmetic number, because the mean of its divisors is an integer number (19406042415).

Almost surely, 2^51749446438 is an apocalyptic number.

51749446438 is a deficient number, since it is larger than the sum of its proper divisors (25874723222).

51749446438 is a wasteful number, since it uses less digits than its factorization.

51749446438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25874723221.

The product of its digits is 11612160, while the sum is 55.

The spelling of 51749446438 in words is "fifty-one billion, seven hundred forty-nine million, four hundred forty-six thousand, four hundred thirty-eight".