666525137451107 has 4 divisors (see below), whose sum is σ = 727118331764856. Its totient is φ = 605931943137360.

The previous prime is 666525137451029. The next prime is 666525137451113. The reversal of 666525137451107 is 701154731525666.

It is a happy number.

666525137451107 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 666525137451107 - 2⁴⁶ = 596156393273443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666525137454107) 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, 30296597156858 + ... + 30296597156879.

It is an arithmetic number, because the mean of its divisors is an integer number (181779582941214).

Almost surely, 2^{666525137451107} is an apocalyptic number.

666525137451107 is a deficient number, since it is larger than the sum of its proper divisors (60593194313749).

666525137451107 is a wasteful number, since it uses less digits than its factorization.

666525137451107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60593194313748.

The product of its (nonzero) digits is 31752000, while the sum is 59.

The spelling of 666525137451107 in words is "six hundred sixty-six trillion, five hundred twenty-five billion, one hundred thirty-seven million, four hundred fifty-one thousand, one hundred seven".