51478396906 has 16 divisors (see below), whose sum is σ = 79365310920. Its totient is φ = 25032775680.

The previous prime is 51478396831. The next prime is 51478396913. The reversal of 51478396906 is 60969387415.

It can be written as a sum of positive squares in 4 ways, for example, as 8062423681 + 43415973225 = 89791^2 + 208365^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2359671 + ... + 2381386.

Almost surely, 2^51478396906 is an apocalyptic number.

51478396906 is a deficient number, since it is larger than the sum of its proper divisors (27886914014).

51478396906 is a wasteful number, since it uses less digits than its factorization.

51478396906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4741209.

The product of its (nonzero) digits is 9797760, while the sum is 58.

The spelling of 51478396906 in words is "fifty-one billion, four hundred seventy-eight million, three hundred ninety-six thousand, nine hundred six".