51478396964 has 12 divisors (see below), whose sum is σ = 90090147084. Its totient is φ = 25738354944.

The previous prime is 51478396943. The next prime is 51478396969. The reversal of 51478396964 is 46969387415.

It can be written as a sum of positive squares in 2 ways, for example, as 15560566564 + 35917830400 = 124742^2 + 189520^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51478396897 and 51478396906.

It is not an unprimeable number, because it can be changed into a prime (51478396969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61877 + ... + 326780.

It is an arithmetic number, because the mean of its divisors is an integer number (7507512257).

Almost surely, 2^51478396964 is an apocalyptic number.

It is an amenable number.

51478396964 is a deficient number, since it is larger than the sum of its proper divisors (38611750120).

51478396964 is a wasteful number, since it uses less digits than its factorization.

51478396964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421774 (or 421772 counting only the distinct ones).

The product of its digits is 39191040, while the sum is 62.

The spelling of 51478396964 in words is "fifty-one billion, four hundred seventy-eight million, three hundred ninety-six thousand, nine hundred sixty-four".