125640622440 has 48 divisors (see below), whose sum is σ = 408332024100. Its totient is φ = 33504165888.

The previous prime is 125640622439. The next prime is 125640622447. The reversal of 125640622440 is 44226046521.

125640622440 is a `hidden beast` number, since 1 + 2 + 5 + 6 + 406 + 2 + 244 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 122313870756 + 3326751684 = 349734^2 + 57678^2 .

It is a super-2 number, since 2×125640622440² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 125640622395 and 125640622404.

It is not an unprimeable number, because it can be changed into a prime (125640622447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 174500505 + ... + 174501224.

Almost surely, 2^125640622440 is an apocalyptic number.

125640622440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

125640622440 is an abundant number, since it is smaller than the sum of its proper divisors (282691401660).

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

125640622440 is a wasteful number, since it uses less digits than its factorization.

125640622440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349001746 (or 349001739 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 36.

Adding to 125640622440 its reverse (44226046521), we get a palindrome (169866668961).

The spelling of 125640622440 in words is "one hundred twenty-five billion, six hundred forty million, six hundred twenty-two thousand, four hundred forty".