65631381144 has 64 divisors (see below), whose sum is σ = 192586310400. Its totient is φ = 18245015424.

The previous prime is 65631381131. The next prime is 65631381163. The reversal of 65631381144 is 44118313656.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 65631381096 and 65631381105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5273014 + ... + 5285445.

It is an arithmetic number, because the mean of its divisors is an integer number (3009161100).

Almost surely, 2^65631381144 is an apocalyptic number.

It is an amenable number.

65631381144 is an abundant number, since it is smaller than the sum of its proper divisors (126954929256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65631381144 is a wasteful number, since it uses less digits than its factorization.

65631381144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10558512 (or 10558508 counting only the distinct ones).

The product of its digits is 207360, while the sum is 42.

The spelling of 65631381144 in words is "sixty-five billion, six hundred thirty-one million, three hundred eighty-one thousand, one hundred forty-four".