666786051 has 12 divisors (see below), whose sum is σ = 973065912. Its totient is φ = 439940736.

The previous prime is 666786047. The next prime is 666786073. The reversal of 666786051 is 150687666.

It is not a de Polignac number, because 666786051 - 2² = 666786047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666785988 and 666786006.

It is not an unprimeable number, because it can be changed into a prime (666786041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 381021 + ... + 382766.

It is an arithmetic number, because the mean of its divisors is an integer number (81088826).

Almost surely, 2^666786051 is an apocalyptic number.

666786051 is a deficient number, since it is larger than the sum of its proper divisors (306279861).

666786051 is a wasteful number, since it uses less digits than its factorization.

666786051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763890 (or 763887 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 666786051 is about 25822.2007388991. The cubic root of 666786051 is about 873.6326075346.

The spelling of 666786051 in words is "six hundred sixty-six million, seven hundred eighty-six thousand, fifty-one".