66151110661 has 8 divisors (see below), whose sum is σ = 66883803224. Its totient is φ = 65419453440.

The previous prime is 66151110659. The next prime is 66151110671. The reversal of 66151110661 is 16601115166.

It can be written as a sum of positive squares in 4 ways, for example, as 45441022561 + 20710088100 = 213169^2 + 143910^2 .

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 66151110661 - 2¹ = 66151110659 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 (66151110601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129990 + ... + 386263.

It is an arithmetic number, because the mean of its divisors is an integer number (8360475403).

Almost surely, 2^66151110661 is an apocalyptic number.

It is an amenable number.

66151110661 is a deficient number, since it is larger than the sum of its proper divisors (732692563).

66151110661 is a wasteful number, since it uses less digits than its factorization.

66151110661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517671.

The product of its (nonzero) digits is 6480, while the sum is 34.

The spelling of 66151110661 in words is "sixty-six billion, one hundred fifty-one million, one hundred ten thousand, six hundred sixty-one".