66251515064201 has 8 divisors (see below), whose sum is σ = 71472222689544. Its totient is φ = 61177869625600.

The previous prime is 66251515064153. The next prime is 66251515064219. The reversal of 66251515064201 is 10246051515266.

It can be written as a sum of positive squares in 4 ways, for example, as 36075159187600 + 30176355876601 = 6006260^2 + 5493301^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66251515064201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66251515064221) 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, 36765545750 + ... + 36765547551.

It is an arithmetic number, because the mean of its divisors is an integer number (8934027836193).

Almost surely, 2^{66251515064201} is an apocalyptic number.

It is an amenable number.

66251515064201 is a deficient number, since it is larger than the sum of its proper divisors (5220707625343).

66251515064201 is a wasteful number, since it uses less digits than its factorization.

66251515064201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73531093371.

The product of its (nonzero) digits is 432000, while the sum is 44.

Adding to 66251515064201 its reverse (10246051515266), we get a palindrome (76497566579467).

The spelling of 66251515064201 in words is "sixty-six trillion, two hundred fifty-one billion, five hundred fifteen million, sixty-four thousand, two hundred one".