125215665 has 16 divisors (see below), whose sum is σ = 206808576. Its totient is φ = 64627200.

The previous prime is 125215663. The next prime is 125215667. The reversal of 125215665 is 566512521.

It is an interprime number because it is at equal distance from previous prime (125215663) and next prime (125215667).

It is not a de Polignac number, because 125215665 - 2¹ = 125215663 is a prime.

It is a super-2 number, since 2×125215665² = 31357925522784450, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (125215663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134176 + ... + 135105.

It is an arithmetic number, because the mean of its divisors is an integer number (12925536).

Almost surely, 2^125215665 is an apocalyptic number.

125215665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

125215665 is a deficient number, since it is larger than the sum of its proper divisors (81592911).

125215665 is a wasteful number, since it uses less digits than its factorization.

125215665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269320.

The product of its digits is 18000, while the sum is 33.

The square root of 125215665 is about 11189.9805629858. The cubic root of 125215665 is about 500.2873881178.

The spelling of 125215665 in words is "one hundred twenty-five million, two hundred fifteen thousand, six hundred sixty-five".