666125951 has 4 divisors (see below), whose sum is σ = 667076904. Its totient is φ = 665175000.

The previous prime is 666125927. The next prime is 666125981. The reversal of 666125951 is 159521666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 666125951 - 2¹⁴ = 666109567 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666125899 and 666125908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666125981) 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, 474425 + ... + 475826.

It is an arithmetic number, because the mean of its divisors is an integer number (166769226).

Almost surely, 2^666125951 is an apocalyptic number.

666125951 is a deficient number, since it is larger than the sum of its proper divisors (950953).

666125951 is an equidigital number, since it uses as much as digits as its factorization.

666125951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950952.

The product of its digits is 97200, while the sum is 41.

The square root of 666125951 is about 25809.4159368243. The cubic root of 666125951 is about 873.3442215329.

The spelling of 666125951 in words is "six hundred sixty-six million, one hundred twenty-five thousand, nine hundred fifty-one".