125624667661777 has 4 divisors (see below), whose sum is σ = 125679742047076. Its totient is φ = 125569593276480.

The previous prime is 125624667661747. The next prime is 125624667661817. The reversal of 125624667661777 is 777166766426521.

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

It can be written as a sum of positive squares in 2 ways, for example, as 64975835656081 + 60648832005696 = 8060759^2 + 7787736^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125624667661777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125624667661747) 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, 27537189228 + ... + 27537193789.

It is an arithmetic number, because the mean of its divisors is an integer number (31419935511769).

Almost surely, 2^{125624667661777} is an apocalyptic number.

It is an amenable number.

125624667661777 is a deficient number, since it is larger than the sum of its proper divisors (55074385299).

125624667661777 is an equidigital number, since it uses as much as digits as its factorization.

125624667661777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55074385298.

The product of its digits is 1493614080, while the sum is 73.

The spelling of 125624667661777 in words is "one hundred twenty-five trillion, six hundred twenty-four billion, six hundred sixty-seven million, six hundred sixty-one thousand, seven hundred seventy-seven".