125666749 has 8 divisors (see below), whose sum is σ = 136243800. Its totient is φ = 115219776.

The previous prime is 125666729. The next prime is 125666753. The reversal of 125666749 is 947666521.

It can be written as a sum of positive squares in 4 ways, for example, as 10791225 + 114875524 = 3285^2 + 10718^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 125666749 - 2⁷ = 125666621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 125666699 and 125666708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125666729) 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, 30502 + ... + 34375.

It is an arithmetic number, because the mean of its divisors is an integer number (17030475).

Almost surely, 2^125666749 is an apocalyptic number.

It is an amenable number.

125666749 is a deficient number, since it is larger than the sum of its proper divisors (10577051).

125666749 is a wasteful number, since it uses less digits than its factorization.

125666749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65039.

The product of its digits is 544320, while the sum is 46.

The square root of 125666749 is about 11210.1181528118. The cubic root of 125666749 is about 500.8874226968.

The spelling of 125666749 in words is "one hundred twenty-five million, six hundred sixty-six thousand, seven hundred forty-nine".