66606655501 has 4 divisors (see below), whose sum is σ = 68023818432. Its totient is φ = 65189492572.

The previous prime is 66606655487. The next prime is 66606655513. The reversal of 66606655501 is 10555660666.

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 66606655501 - 2¹¹ = 66606653453 is a prime.

It is a super-2 number, since 2×66606655501² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66606650501) 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, 708581395 + ... + 708581488.

It is an arithmetic number, because the mean of its divisors is an integer number (17005954608).

Almost surely, 2^66606655501 is an apocalyptic number.

It is an amenable number.

66606655501 is a deficient number, since it is larger than the sum of its proper divisors (1417162931).

66606655501 is a wasteful number, since it uses less digits than its factorization.

66606655501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1417162930.

The product of its (nonzero) digits is 972000, while the sum is 46.

The spelling of 66606655501 in words is "sixty-six billion, six hundred six million, six hundred fifty-five thousand, five hundred one".