66655001066501 has 4 divisors (see below), whose sum is σ = 66655651214400. Its totient is φ = 66654350918604.

The previous prime is 66655001066483. The next prime is 66655001066503. The reversal of 66655001066501 is 10566010055666.

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 not a de Polignac number, because 66655001066501 - 2³⁸ = 66380123159557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66655001066503) 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, 324920141 + ... + 325125218.

It is an arithmetic number, because the mean of its divisors is an integer number (16663912803600).

Almost surely, 2^{66655001066501} is an apocalyptic number.

It is an amenable number.

66655001066501 is a deficient number, since it is larger than the sum of its proper divisors (650147899).

66655001066501 is a wasteful number, since it uses less digits than its factorization.

66655001066501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650147898.

The product of its (nonzero) digits is 972000, while the sum is 47.

The spelling of 66655001066501 in words is "sixty-six trillion, six hundred fifty-five billion, one million, sixty-six thousand, five hundred one".