125565640 has 16 divisors (see below), whose sum is σ = 282522780. Its totient is φ = 50226240.

The previous prime is 125565631. The next prime is 125565641. The reversal of 125565640 is 46565521.

It can be written as a sum of positive squares in 2 ways, for example, as 116165284 + 9400356 = 10778^2 + 3066^2 .

It is a junction number, because it is equal to n+sod(n) for n = 125565596 and 125565605.

It is not an unprimeable number, because it can be changed into a prime (125565641) 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, 1569531 + ... + 1569610.

Almost surely, 2^125565640 is an apocalyptic number.

125565640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

125565640 is an abundant number, since it is smaller than the sum of its proper divisors (156957140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

125565640 is a wasteful number, since it uses less digits than its factorization.

125565640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3139152 (or 3139148 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 34.

The square root of 125565640 is about 11205.6075248065. The cubic root of 125565640 is about 500.7530519229.

The spelling of 125565640 in words is "one hundred twenty-five million, five hundred sixty-five thousand, six hundred forty".