666748090 has 8 divisors (see below), whose sum is σ = 1200146580. Its totient is φ = 266699232.

The previous prime is 666748087. The next prime is 666748123. The reversal of 666748090 is 90847666.

It can be written as a sum of positive squares in 2 ways, for example, as 620657569 + 46090521 = 24913^2 + 6789^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 666748090.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33337395 + ... + 33337414.

Almost surely, 2^666748090 is an apocalyptic number.

666748090 is a deficient number, since it is larger than the sum of its proper divisors (533398490).

666748090 is a wasteful number, since it uses less digits than its factorization.

666748090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66674816.

The product of its (nonzero) digits is 435456, while the sum is 46.

The square root of 666748090 is about 25821.4656826447. The cubic root of 666748090 is about 873.6160282052.

The spelling of 666748090 in words is "six hundred sixty-six million, seven hundred forty-eight thousand, ninety".