125566445 has 4 divisors (see below), whose sum is σ = 150679740. Its totient is φ = 100453152.

The previous prime is 125566439. The next prime is 125566489. The reversal of 125566445 is 544665521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 544665521 = 59 ⋅9231619.

It can be written as a sum of positive squares in 2 ways, for example, as 18774889 + 106791556 = 4333^2 + 10334^2 .

It is a cyclic number.

It is not a de Polignac number, because 125566445 - 2¹⁰ = 125565421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 125566399 and 125566408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12556640 + ... + 12556649.

It is an arithmetic number, because the mean of its divisors is an integer number (37669935).

Almost surely, 2^125566445 is an apocalyptic number.

It is an amenable number.

125566445 is a deficient number, since it is larger than the sum of its proper divisors (25113295).

125566445 is an equidigital number, since it uses as much as digits as its factorization.

125566445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25113294.

The product of its digits is 144000, while the sum is 38.

The square root of 125566445 is about 11205.6434442650. The cubic root of 125566445 is about 500.7541220281.

The spelling of 125566445 in words is "one hundred twenty-five million, five hundred sixty-six thousand, four hundred forty-five".