65505721612111 has 16 divisors (see below), whose sum is σ = 71645345976960. Its totient is φ = 59396944316320.

The previous prime is 65505721612081. The next prime is 65505721612141. The reversal of 65505721612111 is 11121612750556.

It is an interprime number because it is at equal distance from previous prime (65505721612081) and next prime (65505721612141).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65505721612111 is a prime.

It is a super-2 number, since 2×65505721612111² (a number of 28 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 (65505721612141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12843345 + ... + 17203573.

It is an arithmetic number, because the mean of its divisors is an integer number (4477834123560).

Almost surely, 2^{65505721612111} is an apocalyptic number.

65505721612111 is a deficient number, since it is larger than the sum of its proper divisors (6139624364849).

65505721612111 is a wasteful number, since it uses less digits than its factorization.

65505721612111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4363766.

The product of its (nonzero) digits is 126000, while the sum is 43.

The spelling of 65505721612111 in words is "sixty-five trillion, five hundred five billion, seven hundred twenty-one million, six hundred twelve thousand, one hundred eleven".