6665125061 has 4 divisors (see below), whose sum is σ = 7617285792. Its totient is φ = 5712964332.

The previous prime is 6665124997. The next prime is 6665125063. The reversal of 6665125061 is 1605215666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1605215666 = 2 ⋅802607833.

It is a cyclic number.

It is not a de Polignac number, because 6665125061 - 2⁶ = 6665124997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6665125063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 476080355 + ... + 476080368.

It is an arithmetic number, because the mean of its divisors is an integer number (1904321448).

Almost surely, 2^6665125061 is an apocalyptic number.

It is an amenable number.

6665125061 is a deficient number, since it is larger than the sum of its proper divisors (952160731).

6665125061 is an equidigital number, since it uses as much as digits as its factorization.

6665125061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952160730.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 6665125061 is about 81640.2171787900. The cubic root of 6665125061 is about 1881.9269759311.

The spelling of 6665125061 in words is "six billion, six hundred sixty-five million, one hundred twenty-five thousand, sixty-one".