51023720162 has 4 divisors (see below), whose sum is σ = 76535580246. Its totient is φ = 25511860080.

The previous prime is 51023720159. The next prime is 51023720179. The reversal of 51023720162 is 26102732015.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 26102732015 = 5 ⋅5220546403.

It can be written as a sum of positive squares in only one way, i.e., 50589456241 + 434263921 = 224921^2 + 20839^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12755930039 + ... + 12755930042.

Almost surely, 2^51023720162 is an apocalyptic number.

51023720162 is a deficient number, since it is larger than the sum of its proper divisors (25511860084).

51023720162 is a wasteful number, since it uses less digits than its factorization.

51023720162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25511860083.

The product of its (nonzero) digits is 5040, while the sum is 29.

The spelling of 51023720162 in words is "fifty-one billion, twenty-three million, seven hundred twenty thousand, one hundred sixty-two".