125541949666 has 16 divisors (see below), whose sum is σ = 216763081920. Its totient is φ = 53416614960.

The previous prime is 125541949613. The next prime is 125541949691. The reversal of 125541949666 is 666949145521.

It is a super-2 number, since 2×125541949666² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 125541949666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32254465 + ... + 32258356.

It is an arithmetic number, because the mean of its divisors is an integer number (13547692620).

Almost surely, 2^125541949666 is an apocalyptic number.

125541949666 is a deficient number, since it is larger than the sum of its proper divisors (91221132254).

125541949666 is a wasteful number, since it uses less digits than its factorization.

125541949666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64512969.

The product of its digits is 13996800, while the sum is 58.

The spelling of 125541949666 in words is "one hundred twenty-five billion, five hundred forty-one million, nine hundred forty-nine thousand, six hundred sixty-six".