125564421643 has 16 divisors (see below), whose sum is σ = 128731052736. Its totient is φ = 122429623680.

The previous prime is 125564421637. The next prime is 125564421673. The reversal of 125564421643 is 346124465521.

It is a cyclic number.

It is not a de Polignac number, because 125564421643 - 2²¹ = 125562324491 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 125564421643.

It is not an unprimeable number, because it can be changed into a prime (125564421623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5857621 + ... + 5879017.

It is an arithmetic number, because the mean of its divisors is an integer number (8045690796).

Almost surely, 2^125564421643 is an apocalyptic number.

125564421643 is a deficient number, since it is larger than the sum of its proper divisors (3166631093).

125564421643 is a wasteful number, since it uses less digits than its factorization.

125564421643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22134.

The product of its digits is 691200, while the sum is 43.

The spelling of 125564421643 in words is "one hundred twenty-five billion, five hundred sixty-four million, four hundred twenty-one thousand, six hundred forty-three".