65636390416 has 45 divisors (see below), whose sum is σ = 134255790543. Its totient is φ = 31081698720.

The previous prime is 65636390401. The next prime is 65636390419. The reversal of 65636390416 is 61409363656.

The square root of 65636390416 is 256196.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65636390416.

It is not an unprimeable number, because it can be changed into a prime (65636390419) by changing a digit.

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 8 ways as a sum of consecutive naturals, for example, 19469211 + ... + 19472581.

Almost surely, 2^65636390416 is an apocalyptic number.

65636390416 is the 256196-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65636390416

65636390416 is an abundant number, since it is smaller than the sum of its proper divisors (68619400127).

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

65636390416 is an frugal number, since it uses more digits than its factorization.

65636390416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6788 (or 3392 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 49.

Multiplying 65636390416 by its sum of digits (49), we get a square (3216183130384 = 1793372²).

The spelling of 65636390416 in words is "sixty-five billion, six hundred thirty-six million, three hundred ninety thousand, four hundred sixteen".