66487898507 has 4 divisors (see below), whose sum is σ = 66489081120. Its totient is φ = 66486715896.

The previous prime is 66487898459. The next prime is 66487898537. The reversal of 66487898507 is 70589878466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70589878466 = 2 ⋅35294939233.

It is a cyclic number.

It is not a de Polignac number, because 66487898507 - 2²⁴ = 66471121291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66487898537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 502532 + ... + 620897.

It is an arithmetic number, because the mean of its divisors is an integer number (16622270280).

Almost surely, 2^66487898507 is an apocalyptic number.

66487898507 is a deficient number, since it is larger than the sum of its proper divisors (1182613).

66487898507 is a wasteful number, since it uses less digits than its factorization.

66487898507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1182612.

The product of its (nonzero) digits is 162570240, while the sum is 68.

The spelling of 66487898507 in words is "sixty-six billion, four hundred eighty-seven million, eight hundred ninety-eight thousand, five hundred seven".