51645230162 has 4 divisors (see below), whose sum is σ = 77467845246. Its totient is φ = 25822615080.

The previous prime is 51645230149. The next prime is 51645230207. The reversal of 51645230162 is 26103254615.

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., 30793581361 + 20851648801 = 175481^2 + 144401^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12911307539 + ... + 12911307542.

Almost surely, 2^51645230162 is an apocalyptic number.

51645230162 is a deficient number, since it is larger than the sum of its proper divisors (25822615084).

51645230162 is a wasteful number, since it uses less digits than its factorization.

51645230162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25822615083.

The product of its (nonzero) digits is 43200, while the sum is 35.

Adding to 51645230162 its reverse (26103254615), we get a palindrome (77748484777).

The spelling of 51645230162 in words is "fifty-one billion, six hundred forty-five million, two hundred thirty thousand, one hundred sixty-two".