65505551091 has 8 divisors (see below), whose sum is σ = 87384876480. Its totient is φ = 43648296552.

The previous prime is 65505551011. The next prime is 65505551093. The reversal of 65505551091 is 19015550556.

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

It is not a de Polignac number, because 65505551091 - 2¹⁹ = 65505026803 is a prime.

It is a super-2 number, since 2×65505551091² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65505551093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5510785 + ... + 5522658.

It is an arithmetic number, because the mean of its divisors is an integer number (10923109560).

Almost surely, 2^65505551091 is an apocalyptic number.

65505551091 is a deficient number, since it is larger than the sum of its proper divisors (21879325389).

65505551091 is a wasteful number, since it uses less digits than its factorization.

65505551091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11035425.

The product of its (nonzero) digits is 168750, while the sum is 42.

The spelling of 65505551091 in words is "sixty-five billion, five hundred five million, five hundred fifty-one thousand, ninety-one".