65626616440 has 128 divisors (see below), whose sum is σ = 184423910400. Its totient is φ = 20418554880.

The previous prime is 65626616387. The next prime is 65626616441. The reversal of 65626616440 is 4461662656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65626616441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1733797 + ... + 1771243.

It is an arithmetic number, because the mean of its divisors is an integer number (1440811800).

Almost surely, 2^65626616440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65626616440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92211955200).

65626616440 is an abundant number, since it is smaller than the sum of its proper divisors (118797293960).

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

65626616440 is a wasteful number, since it uses less digits than its factorization.

65626616440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38045 (or 38041 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 46.

The spelling of 65626616440 in words is "sixty-five billion, six hundred twenty-six million, six hundred sixteen thousand, four hundred forty".