125561506450 has 24 divisors (see below), whose sum is σ = 233657472420. Its totient is φ = 50200286400.

The previous prime is 125561506417. The next prime is 125561506457. The reversal of 125561506450 is 54605165521.

It can be written as a sum of positive squares in 6 ways, for example, as 7575439369 + 117986067081 = 87037^2 + 343491^2 .

It is not an unprimeable number, because it can be changed into a prime (125561506457) 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, 503421 + ... + 710320.

Almost surely, 2^125561506450 is an apocalyptic number.

125561506450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

125561506450 is a deficient number, since it is larger than the sum of its proper divisors (108095965970).

125561506450 is a wasteful number, since it uses less digits than its factorization.

125561506450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1215822 (or 1215817 counting only the distinct ones).

The product of its (nonzero) digits is 180000, while the sum is 40.

The spelling of 125561506450 in words is "one hundred twenty-five billion, five hundred sixty-one million, five hundred six thousand, four hundred fifty".