125995661 has 4 divisors (see below), whose sum is σ = 137449824. Its totient is φ = 114541500.

The previous prime is 125995657. The next prime is 125995663. The reversal of 125995661 is 166599521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 166599521 = 11 ⋅15145411.

It is a cyclic number.

It is not a de Polignac number, because 125995661 - 2² = 125995657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125995663) 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, 5727065 + ... + 5727086.

It is an arithmetic number, because the mean of its divisors is an integer number (34362456).

Almost surely, 2^125995661 is an apocalyptic number.

125995661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

125995661 is a deficient number, since it is larger than the sum of its proper divisors (11454163).

125995661 is a wasteful number, since it uses less digits than its factorization.

125995661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11454162.

The product of its digits is 145800, while the sum is 44.

The square root of 125995661 is about 11224.7788842364. The cubic root of 125995661 is about 501.3240387479.

The spelling of 125995661 in words is "one hundred twenty-five million, nine hundred ninety-five thousand, six hundred sixty-one".