56001166661 has 8 divisors (see below), whose sum is σ = 61094577504. Its totient is φ = 50908155120.

The previous prime is 56001166651. The next prime is 56001166667. The reversal of 56001166661 is 16666110065.

It is a happy number.

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 56001166661 - 2¹⁴ = 56001150277 is a prime.

It is a super-2 number, since 2×56001166661² (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 (56001166667) 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, 245330 + ... + 414956.

It is an arithmetic number, because the mean of its divisors is an integer number (7636822188).

Almost surely, 2^56001166661 is an apocalyptic number.

It is an amenable number.

56001166661 is a deficient number, since it is larger than the sum of its proper divisors (5093410843).

56001166661 is a wasteful number, since it uses less digits than its factorization.

56001166661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199651.

The product of its (nonzero) digits is 38880, while the sum is 38.

The spelling of 56001166661 in words is "fifty-six billion, one million, one hundred sixty-six thousand, six hundred sixty-one".