66125051 has 4 divisors (see below), whose sum is σ = 66176952. Its totient is φ = 66073152.

The previous prime is 66125041. The next prime is 66125057. The reversal of 66125051 is 15052166.

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 66125051 - 2⁶ = 66124987 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66125051.

It is not an unprimeable number, because it can be changed into a prime (66125057) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 23990 + ... + 26603.

It is an arithmetic number, because the mean of its divisors is an integer number (16544238).

Almost surely, 2^66125051 is an apocalyptic number.

66125051 is a deficient number, since it is larger than the sum of its proper divisors (51901).

66125051 is a wasteful number, since it uses less digits than its factorization.

66125051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51900.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 66125051 is about 8131.7311195095. The cubic root of 66125051 is about 404.3790739158.

The spelling of 66125051 in words is "sixty-six million, one hundred twenty-five thousand, fifty-one".