125554521220 has 24 divisors (see below), whose sum is σ = 263716276824. Its totient is φ = 50211945216.

The previous prime is 125554521217. The next prime is 125554521259. The reversal of 125554521220 is 22125455521.

It can be written as a sum of positive squares in 4 ways, for example, as 1937664 + 125552583556 = 1392^2 + 354334^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 511639 + ... + 716158.

It is an arithmetic number, because the mean of its divisors is an integer number (10988178201).

Almost surely, 2^125554521220 is an apocalyptic number.

125554521220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

125554521220 is an abundant number, since it is smaller than the sum of its proper divisors (138161755604).

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

125554521220 is a wasteful number, since it uses less digits than its factorization.

125554521220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1232919 (or 1232917 counting only the distinct ones).

The product of its (nonzero) digits is 40000, while the sum is 34.

Adding to 125554521220 its reverse (22125455521), we get a palindrome (147679976741).

The spelling of 125554521220 in words is "one hundred twenty-five billion, five hundred fifty-four million, five hundred twenty-one thousand, two hundred twenty".