66500611147409 has 4 divisors (see below), whose sum is σ = 66979032810480. Its totient is φ = 66022189484340.

The previous prime is 66500611147381. The next prime is 66500611147447. The reversal of 66500611147409 is 90474111600566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66500611147409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66500611147499) 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, 239210831327 + ... + 239210831604.

It is an arithmetic number, because the mean of its divisors is an integer number (16744758202620).

Almost surely, 2^{66500611147409} is an apocalyptic number.

It is an amenable number.

66500611147409 is a deficient number, since it is larger than the sum of its proper divisors (478421663071).

66500611147409 is a wasteful number, since it uses less digits than its factorization.

66500611147409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478421663070.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 66500611147409 in words is "sixty-six trillion, five hundred billion, six hundred eleven million, one hundred forty-seven thousand, four hundred nine".