66666061155061 has 4 divisors (see below), whose sum is σ = 66674304771552. Its totient is φ = 66657817538572.

The previous prime is 66666061155049. The next prime is 66666061155151. The reversal of 66666061155061 is 16055116066666.

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 a de Polignac number, because none of the positive numbers 2^k-66666061155061 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66666061154993 and 66666061155011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66666061155461) 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, 4121796115 + ... + 4121812288.

It is an arithmetic number, because the mean of its divisors is an integer number (16668576192888).

Almost surely, 2^{66666061155061} is an apocalyptic number.

It is an amenable number.

66666061155061 is a deficient number, since it is larger than the sum of its proper divisors (8243616491).

66666061155061 is an equidigital number, since it uses as much as digits as its factorization.

66666061155061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8243616490.

The product of its (nonzero) digits is 6998400, while the sum is 55.

The spelling of 66666061155061 in words is "sixty-six trillion, six hundred sixty-six billion, sixty-one million, one hundred fifty-five thousand, sixty-one".