666746696 has 32 divisors (see below), whose sum is σ = 1558630080. Its totient is φ = 259771200.

The previous prime is 666746687. The next prime is 666746713. The reversal of 666746696 is 696647666.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is an unprimeable number.

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, 540575 + ... + 541806.

It is an arithmetic number, because the mean of its divisors is an integer number (48707190).

Almost surely, 2^666746696 is an apocalyptic number.

It is an amenable number.

666746696 is an abundant number, since it is smaller than the sum of its proper divisors (891883384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666746696 is a wasteful number, since it uses less digits than its factorization.

666746696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1082405 (or 1082401 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 56.

The square root of 666746696 is about 25821.4386895851. The cubic root of 666746696 is about 873.6154193687.

The spelling of 666746696 in words is "six hundred sixty-six million, seven hundred forty-six thousand, six hundred ninety-six".