1666610006551 has 16 divisors (see below), whose sum is σ = 1912145292288. Its totient is φ = 1422937929600.

The previous prime is 1666610006519. The next prime is 1666610006557. The reversal of 1666610006551 is 1556000166661.

It is a cyclic number.

It is not a de Polignac number, because 1666610006551 - 2⁵ = 1666610006519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1666610006498 and 1666610006507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666610006557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19086271 + ... + 19173391.

It is an arithmetic number, because the mean of its divisors is an integer number (119509080768).

Almost surely, 2^{1666610006551} is an apocalyptic number.

1666610006551 is a deficient number, since it is larger than the sum of its proper divisors (245535285737).

1666610006551 is a wasteful number, since it uses less digits than its factorization.

1666610006551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97782.

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 1666610006551 in words is "one trillion, six hundred sixty-six billion, six hundred ten million, six thousand, five hundred fifty-one".