66487815201 has 16 divisors (see below), whose sum is σ = 93870741888. Its totient is φ = 41715360000.

The previous prime is 66487815193. The next prime is 66487815221. The reversal of 66487815201 is 10251878466.

It is not a de Polignac number, because 66487815201 - 2³ = 66487815193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66487815221) 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, 1225551 + ... + 1278651.

It is an arithmetic number, because the mean of its divisors is an integer number (5866921368).

Almost surely, 2^66487815201 is an apocalyptic number.

It is an amenable number.

66487815201 is a deficient number, since it is larger than the sum of its proper divisors (27382926687).

66487815201 is a wasteful number, since it uses less digits than its factorization.

66487815201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77672.

The product of its (nonzero) digits is 645120, while the sum is 48.

The spelling of 66487815201 in words is "sixty-six billion, four hundred eighty-seven million, eight hundred fifteen thousand, two hundred one".