125561566 has 16 divisors (see below), whose sum is σ = 203329728. Its totient is φ = 57808800.

The previous prime is 125561549. The next prime is 125561567. The reversal of 125561566 is 665165521.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125561567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5211 + ... + 16681.

It is an arithmetic number, because the mean of its divisors is an integer number (12708108).

Almost surely, 2^125561566 is an apocalyptic number.

125561566 is a deficient number, since it is larger than the sum of its proper divisors (77768162).

125561566 is a wasteful number, since it uses less digits than its factorization.

125561566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11907.

The product of its digits is 54000, while the sum is 37.

The square root of 125561566 is about 11205.4257393461. The cubic root of 125561566 is about 500.7476361897.

The spelling of 125561566 in words is "one hundred twenty-five million, five hundred sixty-one thousand, five hundred sixty-six".