65631381136 has 10 divisors (see below), whose sum is σ = 127160800982. Its totient is φ = 32815690560.

The previous prime is 65631381131. The next prime is 65631381163. The reversal of 65631381136 is 63118313656.

It can be written as a sum of positive squares in only one way, i.e., 39434016400 + 26197364736 = 198580^2 + 161856^2 .

It is a junction number, because it is equal to n+sod(n) for n = 65631381092 and 65631381101.

It is not an unprimeable number, because it can be changed into a prime (65631381131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2050980645 + ... + 2050980676.

Almost surely, 2^65631381136 is an apocalyptic number.

It is an amenable number.

65631381136 is a deficient number, since it is larger than the sum of its proper divisors (61529419846).

65631381136 is a wasteful number, since it uses less digits than its factorization.

65631381136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4101961329 (or 4101961323 counting only the distinct ones).

The product of its digits is 233280, while the sum is 43.

The spelling of 65631381136 in words is "sixty-five billion, six hundred thirty-one million, three hundred eighty-one thousand, one hundred thirty-six".