51504447406 has 4 divisors (see below), whose sum is σ = 77256671112. Its totient is φ = 25752223702.

The previous prime is 51504447361. The next prime is 51504447433. The reversal of 51504447406 is 60474440515.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 12876111850 + ... + 12876111853.

It is an arithmetic number, because the mean of its divisors is an integer number (19314167778).

Almost surely, 2^51504447406 is an apocalyptic number.

51504447406 is a deficient number, since it is larger than the sum of its proper divisors (25752223706).

51504447406 is a wasteful number, since it uses less digits than its factorization.

51504447406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25752223705.

The product of its (nonzero) digits is 268800, while the sum is 40.

The spelling of 51504447406 in words is "fifty-one billion, five hundred four million, four hundred forty-seven thousand, four hundred six".