66606506051611 has 8 divisors (see below), whose sum is σ = 67143500379648. Its totient is φ = 66069944265000.

The previous prime is 66606506051507. The next prime is 66606506051651. The reversal of 66606506051611 is 11615060560666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66606506051611 - 2²³ = 66606497663003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66606506051651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107826135 + ... + 108442096.

It is an arithmetic number, because the mean of its divisors is an integer number (8392937547456).

Almost surely, 2^{66606506051611} is an apocalyptic number.

66606506051611 is a deficient number, since it is larger than the sum of its proper divisors (536994328037).

66606506051611 is a wasteful number, since it uses less digits than its factorization.

66606506051611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216270713.

The product of its (nonzero) digits is 1166400, while the sum is 49.

The spelling of 66606506051611 in words is "sixty-six trillion, six hundred six billion, five hundred six million, fifty-one thousand, six hundred eleven".