125424076666 has 20 divisors (see below), whose sum is σ = 219479083002. Its totient is φ = 53753173656.

The previous prime is 125424076663. The next prime is 125424076691. The reversal of 125424076666 is 666670424521.

It can be written as a sum of positive squares in only one way, i.e., 90369378225 + 35054698441 = 300615^2 + 187229^2 .

It is a super-3 number, since 3×125424076666³ (a number of 34 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (125424076663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 13054765 + ... + 13064368.

Almost surely, 2^125424076666 is an apocalyptic number.

125424076666 is a deficient number, since it is larger than the sum of its proper divisors (94055006336).

125424076666 is an frugal number, since it uses more digits than its factorization.

125424076666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26119163 (or 26119142 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 49.

The spelling of 125424076666 in words is "one hundred twenty-five billion, four hundred twenty-four million, seventy-six thousand, six hundred sixty-six".