51278147438 has 32 divisors (see below), whose sum is σ = 93475871424. Its totient is φ = 20594829312.

The previous prime is 51278147413. The next prime is 51278147441. The reversal of 51278147438 is 83474187215.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 406895 + ... + 517802.

It is an arithmetic number, because the mean of its divisors is an integer number (2921120982).

Almost surely, 2^51278147438 is an apocalyptic number.

51278147438 is a deficient number, since it is larger than the sum of its proper divisors (42197723986).

51278147438 is a wasteful number, since it uses less digits than its factorization.

51278147438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924956.

The product of its digits is 1505280, while the sum is 50.

The spelling of 51278147438 in words is "fifty-one billion, two hundred seventy-eight million, one hundred forty-seven thousand, four hundred thirty-eight".