65006551621201 has 4 divisors (see below), whose sum is σ = 65006619325092. Its totient is φ = 65006483917312.

The previous prime is 65006551621169. The next prime is 65006551621243. The reversal of 65006551621201 is 10212615560056.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20758511934801 + 44248039686400 = 4556151^2 + 6651920^2 .

It is a cyclic number.

It is not a de Polignac number, because 65006551621201 - 2⁵ = 65006551621169 is a prime.

It is a super-2 number, since 2×65006551621201² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65006551621601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32390680 + ... + 34339033.

It is an arithmetic number, because the mean of its divisors is an integer number (16251654831273).

Almost surely, 2^{65006551621201} is an apocalyptic number.

It is an amenable number.

65006551621201 is a deficient number, since it is larger than the sum of its proper divisors (67703891).

65006551621201 is an equidigital number, since it uses as much as digits as its factorization.

65006551621201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67703890.

The product of its (nonzero) digits is 108000, while the sum is 40.

The spelling of 65006551621201 in words is "sixty-five trillion, six billion, five hundred fifty-one million, six hundred twenty-one thousand, two hundred one".