66567451201 has 4 divisors (see below), whose sum is σ = 66568270932. Its totient is φ = 66566631472.

The previous prime is 66567451199. The next prime is 66567451229. The reversal of 66567451201 is 10215476566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10215476566 = 2 ⋅5107738283.

It can be written as a sum of positive squares in 2 ways, for example, as 16267727025 + 50299724176 = 127545^2 + 224276^2 .

It is a cyclic number.

It is not a de Polignac number, because 66567451201 - 2¹ = 66567451199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66567451801) 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, 272770 + ... + 455563.

It is an arithmetic number, because the mean of its divisors is an integer number (16642067733).

Almost surely, 2^66567451201 is an apocalyptic number.

It is an amenable number.

66567451201 is a deficient number, since it is larger than the sum of its proper divisors (819731).

66567451201 is an equidigital number, since it uses as much as digits as its factorization.

66567451201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819730.

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 66567451201 in words is "sixty-six billion, five hundred sixty-seven million, four hundred fifty-one thousand, two hundred one".