65051555161561 has 8 divisors (see below), whose sum is σ = 66286338206400. Its totient is φ = 63817046013552.

The previous prime is 65051555161553. The next prime is 65051555161583. The reversal of 65051555161561 is 16516155515056.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 65051555161561 - 2³ = 65051555161553 is a prime.

It is a super-2 number, since 2×65051555161561² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65051555161499 and 65051555161508.

It is not an unprimeable number, because it can be changed into a prime (65051555191561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67994661 + ... + 68944738.

It is an arithmetic number, because the mean of its divisors is an integer number (8285792275800).

Almost surely, 2^{65051555161561} is an apocalyptic number.

It is an amenable number.

65051555161561 is a deficient number, since it is larger than the sum of its proper divisors (1234783044839).

65051555161561 is a wasteful number, since it uses less digits than its factorization.

65051555161561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136948415.

The product of its (nonzero) digits is 3375000, while the sum is 52.

The spelling of 65051555161561 in words is "sixty-five trillion, fifty-one billion, five hundred fifty-five million, one hundred sixty-one thousand, five hundred sixty-one".