65557065621 has 8 divisors (see below), whose sum is σ = 88211342560. Its totient is φ = 43303749552.

The previous prime is 65557065569. The next prime is 65557065631. The reversal of 65557065621 is 12656075556.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 65557065621 - 2⁹ = 65557065109 is a prime.

It is a super-2 number, since 2×65557065621² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65557065631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100239835 + ... + 100240488.

It is an arithmetic number, because the mean of its divisors is an integer number (11026417820).

Almost surely, 2^65557065621 is an apocalyptic number.

It is an amenable number.

65557065621 is a deficient number, since it is larger than the sum of its proper divisors (22654276939).

65557065621 is a wasteful number, since it uses less digits than its factorization.

65557065621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200480435.

The product of its (nonzero) digits is 1890000, while the sum is 48.

The spelling of 65557065621 in words is "sixty-five billion, five hundred fifty-seven million, sixty-five thousand, six hundred twenty-one".