51830772478 has 4 divisors (see below), whose sum is σ = 77746158720. Its totient is φ = 25915386238.

The previous prime is 51830772451. The next prime is 51830772533. The reversal of 51830772478 is 87427703815.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87427703815 = 5 ⋅17485540763.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12957693118 + ... + 12957693121.

It is an arithmetic number, because the mean of its divisors is an integer number (19436539680).

Almost surely, 2^51830772478 is an apocalyptic number.

51830772478 is a deficient number, since it is larger than the sum of its proper divisors (25915386242).

51830772478 is a wasteful number, since it uses less digits than its factorization.

51830772478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25915386241.

The product of its (nonzero) digits is 2634240, while the sum is 52.

The spelling of 51830772478 in words is "fifty-one billion, eight hundred thirty million, seven hundred seventy-two thousand, four hundred seventy-eight".