65631437520 has 160 divisors (see below), whose sum is σ = 223990842240. Its totient is φ = 15764613120.

The previous prime is 65631437519. The next prime is 65631437539. The reversal of 65631437520 is 2573413656.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 173722 + ... + 401798.

It is an arithmetic number, because the mean of its divisors is an integer number (1399942764).

Almost surely, 2^65631437520 is an apocalyptic number.

65631437520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65631437520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111995421120).

65631437520 is an abundant number, since it is smaller than the sum of its proper divisors (158359404720).

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

65631437520 is a wasteful number, since it uses less digits than its factorization.

65631437520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228213 (or 228207 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 42.

The spelling of 65631437520 in words is "sixty-five billion, six hundred thirty-one million, four hundred thirty-seven thousand, five hundred twenty".