51201408946 has 4 divisors (see below), whose sum is σ = 76802113422. Its totient is φ = 25600704472.

The previous prime is 51201408901. The next prime is 51201408953. The reversal of 51201408946 is 64980410215.

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

It can be written as a sum of positive squares in only one way, i.e., 42275883321 + 8925525625 = 205611^2 + 94475^2 .

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 junction number, because it is equal to n+sod(n) for n = 51201408899 and 51201408908.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12800352235 + ... + 12800352238.

Almost surely, 2^51201408946 is an apocalyptic number.

51201408946 is a deficient number, since it is larger than the sum of its proper divisors (25600704476).

51201408946 is a wasteful number, since it uses less digits than its factorization.

51201408946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25600704475.

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 51201408946 in words is "fifty-one billion, two hundred one million, four hundred eight thousand, nine hundred forty-six".